{"id":4590,"date":"2026-08-07T15:46:02","date_gmt":"2026-08-07T07:46:02","guid":{"rendered":"https:\/\/collagensei.com\/?p=4590"},"modified":"2026-08-07T16:11:56","modified_gmt":"2026-08-07T08:11:56","slug":"%e5%8a%a0%e6%b0%b4%e5%88%86%e8%a7%a3%e3%82%b1%e3%83%a9%e3%83%81%e3%83%b3%e3%81%a8%e3%81%af","status":"publish","type":"post","link":"https:\/\/collagensei.com\/ja\/what-is-hydrolyzed-keratin\/","title":{"rendered":"What Is Hydrolyzed Keratin? Hair Benefits, Safety and Formulation Guide"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_86 ez-toc-wrap-left counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title ez-toc-toggle\" style=\"cursor:pointer\">\u76ee\u6b21<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"\u30c8\u30b0\u30eb\u76ee\u6b21\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">\u30c8\u30b0\u30eb<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/collagensei.com\/ja\/what-is-hydrolyzed-keratin\/#What_Is_Hydrolyzed_Keratin\" >What Is Hydrolyzed Keratin?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/collagensei.com\/ja\/what-is-hydrolyzed-keratin\/#Hydrolyzed_Keratin_vs_Keratin_What_Is_the_Difference\" >Hydrolyzed Keratin vs Keratin: What Is the Difference?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/collagensei.com\/ja\/what-is-hydrolyzed-keratin\/#How_Is_Hydrolyzed_Keratin_Made\" >How Is Hydrolyzed Keratin Made?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/collagensei.com\/ja\/what-is-hydrolyzed-keratin\/#What_Does_Hydrolyzed_Keratin_Do_for_Hair\" >What Does Hydrolyzed Keratin Do for Hair?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/collagensei.com\/ja\/what-is-hydrolyzed-keratin\/#Does_Hydrolyzed_Keratin_Straighten_Hair\" >Does Hydrolyzed Keratin Straighten Hair?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/collagensei.com\/ja\/what-is-hydrolyzed-keratin\/#Is_Hydrolyzed_Keratin_the_Same_as_a_Keratin_Treatment\" >Is Hydrolyzed Keratin the Same as a Keratin Treatment?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/collagensei.com\/ja\/what-is-hydrolyzed-keratin\/#Hydrolyzed_Keratin_vs_Hydrolyzed_Wheat_Protein\" >\u52a0\u6c34\u5206\u89e3\u30b1\u30e9\u30c1\u30f3\u3068\u52a0\u6c34\u5206\u89e3\u30b3\u30e0\u30ae\u30bf\u30f3\u30d1\u30af\u8cea\u306e\u6bd4\u8f03<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/collagensei.com\/ja\/what-is-hydrolyzed-keratin\/#Is_Hydrolyzed_Keratin_Vegan_Halal_or_Kosher\" >Is Hydrolyzed Keratin Vegan, Halal or Kosher?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/collagensei.com\/ja\/what-is-hydrolyzed-keratin\/#Is_Hydrolyzed_Keratin_Safe\" >\u52a0\u6c34\u5206\u89e3\u30b1\u30e9\u30c1\u30f3\u306f\u5b89\u5168\u304b\uff1f<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/collagensei.com\/ja\/what-is-hydrolyzed-keratin\/#Can_Hydrolyzed_Keratin_Cause_Protein_Buildup\" >Can Hydrolyzed Keratin Cause Protein Buildup?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/collagensei.com\/ja\/what-is-hydrolyzed-keratin\/#Topical_Hair-Care_Evidence_Is_Not_Oral_Supplement_Evidence\" >Topical Hair-Care Evidence Is Not Oral Supplement Evidence<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/collagensei.com\/ja\/what-is-hydrolyzed-keratin\/#How_Formulators_Should_Select_a_Hydrolyzed_Keratin_Grade\" >How Formulators Should Select a Hydrolyzed Keratin Grade<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/collagensei.com\/ja\/what-is-hydrolyzed-keratin\/#1_Confirm_the_Exact_Ingredient_Identity\" >1. Confirm the Exact Ingredient Identity<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/collagensei.com\/ja\/what-is-hydrolyzed-keratin\/#2_Define_the_Source_Material\" >2. Define the Source Material<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/collagensei.com\/ja\/what-is-hydrolyzed-keratin\/#3_Review_Molecular-Weight_Distribution\" >3. Review Molecular-Weight Distribution<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/collagensei.com\/ja\/what-is-hydrolyzed-keratin\/#4_Verify_Active_Content_and_Physical_Properties\" >4. Verify Active Content and Physical Properties<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/collagensei.com\/ja\/what-is-hydrolyzed-keratin\/#5_Check_Contaminants_and_Microbiology\" >5. Check Contaminants and Microbiology<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/collagensei.com\/ja\/what-is-hydrolyzed-keratin\/#Finished-Product_Formulation_Checklist\" >Finished-Product Formulation Checklist<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/collagensei.com\/ja\/what-is-hydrolyzed-keratin\/#Cosmetic_Claim_and_Labeling_Considerations\" >Cosmetic Claim and Labeling Considerations<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/collagensei.com\/ja\/what-is-hydrolyzed-keratin\/#Frequently_Asked_Questions\" >\u3088\u304f\u3042\u308b\u8cea\u554f<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/collagensei.com\/ja\/what-is-hydrolyzed-keratin\/#What_is_hydrolyzed_keratin_made_of\" >What is hydrolyzed keratin made of?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/collagensei.com\/ja\/what-is-hydrolyzed-keratin\/#Is_hydrolyzed_keratin_a_protein\" >Is hydrolyzed keratin a protein?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/collagensei.com\/ja\/what-is-hydrolyzed-keratin\/#Does_hydrolyzed_keratin_permanently_repair_hair\" >Does hydrolyzed keratin permanently repair hair?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/collagensei.com\/ja\/what-is-hydrolyzed-keratin\/#Does_hydrolyzed_keratin_straighten_hair\" >Does hydrolyzed keratin straighten hair?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-25\" href=\"https:\/\/collagensei.com\/ja\/what-is-hydrolyzed-keratin\/#Is_hydrolyzed_keratin_formaldehyde\" >Is hydrolyzed keratin formaldehyde?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-26\" href=\"https:\/\/collagensei.com\/ja\/what-is-hydrolyzed-keratin\/#Is_hydrolyzed_keratin_vegan\" >Is hydrolyzed keratin vegan?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-27\" href=\"https:\/\/collagensei.com\/ja\/what-is-hydrolyzed-keratin\/#What_is_the_INCI_name\" >What is the INCI name?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-28\" href=\"https:\/\/collagensei.com\/ja\/what-is-hydrolyzed-keratin\/#What_should_buyers_request_from_a_supplier\" >What should buyers request from a supplier?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-29\" href=\"https:\/\/collagensei.com\/ja\/what-is-hydrolyzed-keratin\/#Conclusion\" >\u7d50\u8ad6<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-30\" href=\"https:\/\/collagensei.com\/ja\/what-is-hydrolyzed-keratin\/#References\" >\u53c2\u8003\u6587\u732e<\/a><\/li><\/ul><\/nav><\/div>\n\nHydrolyzed keratin is keratin protein that has been broken into smaller peptides and amino-acid fragments by acid, enzyme or another hydrolysis process. In hair-care formulas, these fragments can condition damaged fibers, improve surface smoothness and support temporary strength or breakage resistance. It is not the same as a permanent salon straightening treatment, and performance depends on source, molecular-weight profile, concentration and the finished formula.<\/p>\n\n<p>Consumers usually encounter hydrolyzed <a class=\"wpil_keyword_link\" href=\"https:\/\/collagensei.com\/ja\/%e5%8a%a0%e6%b0%b4%e5%88%86%e8%a7%a3%e3%82%b1%e3%83%a9%e3%83%81%e3%83%b3%e3%82%b7%e3%83%ab%e3%82%af%e3%82%b3%e3%83%a9%e3%83%bc%e3%82%b2%e3%83%b3%e3%83%9a%e3%83%97%e3%83%81%e3%83%89\/\" target=\"_blank\"  rel=\"noopener\" title=\"\u52a0\u6c34\u5206\u89e3\u30b1\u30e9\u30c1\u30f3VS\u30b7\u30eb\u30af\u30fb\u30b3\u30e9\u30fc\u30b2\u30f3\u30fb\u30da\u30d7\u30c1\u30c9\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"3883\">\u30b1\u30e9\u30c1\u30f3<\/a> in shampoos, conditioners, masks, leave-in products and styling treatments. Formulators should evaluate the exact INCI identity, animal source, peptide distribution, active solids, odor, solubility, microbiological quality and product-specific safety data rather than relying on the word \u201ckeratin\u201d alone.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1000\" height=\"545\" src=\"https:\/\/collagensei.com\/wp-content\/uploads\/2025\/02\/hydrolyzed-keratin-definition-process.webp\" alt=\"Native keratin vs hydrolyzed keratin protein process\" class=\"wp-image-24233\" srcset=\"https:\/\/collagensei.com\/wp-content\/uploads\/2025\/02\/hydrolyzed-keratin-definition-process.webp 1000w, https:\/\/collagensei.com\/wp-content\/uploads\/2025\/02\/hydrolyzed-keratin-definition-process-300x164.webp 300w, https:\/\/collagensei.com\/wp-content\/uploads\/2025\/02\/hydrolyzed-keratin-definition-process-768x419.webp 768w, https:\/\/collagensei.com\/wp-content\/uploads\/2025\/02\/hydrolyzed-keratin-definition-process-18x10.webp 18w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/figure>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"What_Is_Hydrolyzed_Keratin\"><\/span>What Is Hydrolyzed Keratin?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Keratin is a family of structural proteins found in animal tissues such as hair, wool, horn, hooves, nails and feathers. Native keratin is highly cross-linked and relatively insoluble, which limits its use in water-based cosmetic systems. <a class=\"wpil_keyword_link\" href=\"https:\/\/collagensei.com\/ja\/%e5%8a%a0%e6%b0%b4%e5%88%86%e8%a7%a3%e3%82%b1%e3%83%a9%e3%83%81%e3%83%b3-vs-%e7%89%9b%e8%82%89%e3%82%bf%e3%83%b3%e3%83%91%e3%82%af%e8%b3%aa%e5%8d%98%e9%9b%a2%e7%89%a9\/\" target=\"_blank\"  rel=\"noopener\" title=\"\u52a0\u6c34\u5206\u89e3\u30b1\u30e9\u30c1\u30f3\u3068\u30d3\u30fc\u30d5\u30fb\u30d7\u30ed\u30c6\u30a4\u30f3\u30fb\u30a2\u30a4\u30bd\u30ec\u30fc\u30c8\u3068\u306e\u6bd4\u8f03\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"3886\">\u52a0\u6c34\u5206\u89e3<\/a> breaks the protein into smaller fractions that can be dispersed or dissolved more easily and incorporated into hair, nail and skin-conditioning products.<\/p>\n\n<p>The Cosmetic Ingredient Review definition describes <em>\u52a0\u6c34\u5206\u89e3\u30b1\u30e9\u30c1\u30f3\u200b<\/em> as a hydrolysate of keratin produced by acid, enzyme or another hydrolysis method. It is used mainly as a hair-conditioning, nail-conditioning or skin-conditioning ingredient. The exact source and manufacturing process can change the amino-acid profile, molecular-weight distribution, color, odor and performance of the commercial material.<\/p>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"Hydrolyzed_Keratin_vs_Keratin_What_Is_the_Difference\"><\/span>Hydrolyzed Keratin vs Keratin: What Is the Difference?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<table>\n<thead><tr><th>\u30d5\u30a1\u30af\u30bf\u30fc<\/th><th>Native Keratin<\/th><th>\u52a0\u6c34\u5206\u89e3\u30b1\u30e9\u30c1\u30f3\u200b<\/th><\/tr><\/thead>\n<tbody>\n<tr><td>\u69cb\u9020<\/td><td>Large, fibrous and strongly cross-linked protein<\/td><td>Smaller peptide and amino-acid fractions produced by hydrolysis<\/td><\/tr>\n<tr><td>Water compatibility<\/td><td>Generally difficult to dissolve or formulate in ordinary aqueous systems<\/td><td>Often more water-dispersible or water-soluble, depending on grade<\/td><\/tr>\n<tr><td>Hair interaction<\/td><td>Limited direct use because of size and insolubility<\/td><td>Lower-MW fractions may enter damaged fiber regions; larger fractions may remain closer to the surface and form a conditioning film<\/td><\/tr>\n<tr><td>Common use<\/td><td>Specialty materials and research applications<\/td><td>Shampoos, conditioners, masks, leave-ins, styling products and selected supplement ingredients<\/td><\/tr>\n<tr><td>Key purchase specification<\/td><td>Protein identity and extraction method<\/td><td>Source, INCI identity, molecular-weight distribution, active solids, amino-acid profile and contaminant limits<\/td><\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"How_Is_Hydrolyzed_Keratin_Made\"><\/span>How Is Hydrolyzed Keratin Made?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Commercial hydrolyzed keratin is typically produced from a keratin-rich animal material such as wool, feathers, horn or hoof. The material is cleaned and processed, then hydrolyzed by an acid, enzyme or another controlled method. The resulting liquid can be filtered, concentrated and supplied as a preserved solution or dried into a powder.<\/p>\n\n<p>There is no single universal manufacturing route. Two products sold under the same broad ingredient name can differ substantially in average molecular weight, peptide distribution, active content, residual ash, odor and color. Buyers should therefore request a process summary and batch specification instead of assuming that every hydrolyzed keratin grade is interchangeable.<\/p>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"What_Does_Hydrolyzed_Keratin_Do_for_Hair\"><\/span>What Does Hydrolyzed Keratin Do for Hair?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Hydrolyzed keratin is primarily a conditioning ingredient. Research on relaxed textured hair found that lower- and mid-molecular-weight keratin fractions could penetrate more deeply into the hair fiber, while a high-molecular-weight fraction mainly adsorbed onto the surface. In the same study, some mid- and high-molecular-weight treatments improved mechanical properties and reduced breakage under the tested laboratory conditions.<\/p>\n\n<p>These findings support a molecular-weight-dependent mechanism rather than the broad claim that every keratin product \u201crepairs hair from the inside.\u201d In a finished product, hydrolyzed keratin may contribute to:<\/p>\n<ul>\n<li>Temporary improvement in combability and surface smoothness<\/li>\n<li>Reduced rough feel in chemically or mechanically damaged hair<\/li>\n<li>Film formation that can support shine and manageability<\/li>\n<li>Improved tensile or breakage performance in some tested systems<\/li>\n<li>A protein-conditioning story for masks, conditioners and leave-in products<\/li>\n<\/ul>\n\n<p>Results depend on hair type, damage level, peptide size, charge, product pH, deposition system and the other conditioning ingredients. For a consumer-focused application guide, see the <a href=\"https:\/\/collagensei.com\/ja\/%e6%af%9b%e9%ab%aa%e7%94%a8%e5%8a%a0%e6%b0%b4%e5%88%86%e8%a7%a3%e3%82%b1%e3%83%a9%e3%83%81%e3%83%b3\/\" target=\"_blank\" rel=\"noopener\">hydrolyzed keratin for hair guide<\/a>.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"1000\" height=\"545\" src=\"https:\/\/collagensei.com\/wp-content\/uploads\/2025\/02\/hydrolyzed-keratin-molecular-weight-hair.webp\" alt=\"Hydrolyzed keratin molecular weight interaction with damaged hair\" class=\"wp-image-24237\" srcset=\"https:\/\/collagensei.com\/wp-content\/uploads\/2025\/02\/hydrolyzed-keratin-molecular-weight-hair.webp 1000w, https:\/\/collagensei.com\/wp-content\/uploads\/2025\/02\/hydrolyzed-keratin-molecular-weight-hair-300x164.webp 300w, https:\/\/collagensei.com\/wp-content\/uploads\/2025\/02\/hydrolyzed-keratin-molecular-weight-hair-768x419.webp 768w, https:\/\/collagensei.com\/wp-content\/uploads\/2025\/02\/hydrolyzed-keratin-molecular-weight-hair-18x10.webp 18w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/figure>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"Does_Hydrolyzed_Keratin_Straighten_Hair\"><\/span>Does Hydrolyzed Keratin Straighten Hair?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>No. Hydrolyzed keratin by itself is not a permanent hair-straightening agent. A shampoo, conditioner or mask containing hydrolyzed keratin may make hair feel smoother, reduce frizz temporarily or improve manageability, but it does not permanently rearrange the hair\u2019s internal bonds.<\/p>\n\n<p>The term \u201ckeratin treatment\u201d is used for several very different product categories. Some salon smoothing or straightening services use heat together with reactive chemicals or aldehyde-releasing systems. Hydrolyzed keratin may be present in such a formula, but it is not the ingredient responsible for permanent or semi-permanent straightening. Brands should avoid implying that a hydrolyzed keratin raw material alone delivers salon-straightening results.<\/p>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"Is_Hydrolyzed_Keratin_the_Same_as_a_Keratin_Treatment\"><\/span>Is Hydrolyzed Keratin the Same as a Keratin Treatment?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>No. Hydrolyzed keratin is an ingredient. A keratin treatment is a finished service or product system that may contain proteins, conditioning agents, silicones, polymers, acids, preservatives and other functional materials. Consumers should evaluate the complete ingredient list and product directions rather than assuming that every product marketed with the word \u201ckeratin\u201d has the same chemistry or safety profile.<\/p>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"Hydrolyzed_Keratin_vs_Hydrolyzed_Wheat_Protein\"><\/span>\u52a0\u6c34\u5206\u89e3\u30b1\u30e9\u30c1\u30f3\u3068\u52a0\u6c34\u5206\u89e3\u30b3\u30e0\u30ae\u30bf\u30f3\u30d1\u30af\u8cea\u306e\u6bd4\u8f03<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Hydrolyzed keratin is animal-derived and has a keratin-related amino-acid profile. Hydrolyzed wheat protein is plant-derived and is commonly selected for film formation, moisture feel and plant-based positioning. Neither name alone predicts finished-product performance. Molecular weight, charge, allergen status, sensory behavior and formula compatibility are more useful decision factors.<\/p>\n\n<p>Brands comparing animal and plant protein systems can review the full <a href=\"https:\/\/collagensei.com\/ja\/%e5%8a%a0%e6%b0%b4%e5%88%86%e8%a7%a3%e3%82%b1%e3%83%a9%e3%83%81%e3%83%b3%e3%81%a8%e5%8a%a0%e6%b0%b4%e5%88%86%e8%a7%a3%e5%b0%8f%e9%ba%a6%e3%82%bf%e3%83%b3%e3%83%91%e3%82%af%e8%b3%aa%e3%81%ae%e6%af%94\/\" target=\"_blank\" rel=\"noopener\">\u52a0\u6c34\u5206\u89e3\u30b1\u30e9\u30c1\u30f3\u3068\u52a0\u6c34\u5206\u89e3\u5c0f\u9ea6\u30bf\u30f3\u30d1\u30af\u8cea\u306e\u6bd4\u8f03<\/a> formulation guide.<\/p>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"Is_Hydrolyzed_Keratin_Vegan_Halal_or_Kosher\"><\/span>Is Hydrolyzed Keratin Vegan, Halal or Kosher?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Hydrolyzed keratin is generally not vegan because true keratin is an animal protein. Products described as \u201cvegan keratin\u201d are usually blends of plant proteins or amino acids designed to imitate some conditioning properties of keratin; they are not animal keratin.<\/p>\n\n<p>Halal and kosher status cannot be assumed from the ingredient name. It depends on the animal source, slaughter status where relevant, processing aids, manufacturing controls and certification. Buyers should request current certificates and source declarations for the exact production site and batch family.<\/p>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"Is_Hydrolyzed_Keratin_Safe\"><\/span>\u52a0\u6c34\u5206\u89e3\u30b1\u30e9\u30c1\u30f3\u306f\u5b89\u5168\u304b\uff1f<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The Cosmetic Ingredient Review Expert Panel concluded that the assessed keratin-derived ingredients, including Hydrolyzed Keratin, are safe in cosmetics under the practices of use and concentrations described in its safety assessment. That conclusion does not eliminate the need for finished-product safety substantiation, appropriate preservation, impurity control, exposure assessment and compliant labeling.<\/p>\n\n<p>Hydrolyzed proteins can vary widely in source and molecular weight. Consumers with a known allergy to a source material or a history of reactions to protein-containing cosmetics should review the full product label and seek professional advice when appropriate. Stop use if a product causes persistent redness, swelling, itching or eye irritation.<\/p>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"Can_Hydrolyzed_Keratin_Cause_Protein_Buildup\"><\/span>Can Hydrolyzed Keratin Cause Protein Buildup?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u201cProtein buildup\u201d is not a standardized medical diagnosis, but some users report that frequent use of protein-rich hair products makes their hair feel stiff, dry, rough or more prone to snapping. This may reflect the combined effects of the product film, hair porosity, cleansing routine and moisture balance.<\/p>\n\n<p>If hair feels progressively rigid or rough, reduce the frequency of the protein-containing product, use a gentle cleanser to remove residue and alternate with a moisturizing conditioner. Do not add raw hydrolyzed <a class=\"wpil_keyword_link\" href=\"https:\/\/collagensei.com\/ja\/%e3%82%b1%e3%83%a9%e3%83%81%e3%83%b3%e3%83%91%e3%82%a6%e3%83%80%e3%83%bc\/\" target=\"_blank\"  rel=\"noopener\" title=\"\u30b1\u30e9\u30c1\u30f3\u30fb\u30d1\u30a6\u30c0\u30fc\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"3882\">\u30b1\u30e9\u30c1\u30f3\u30d1\u30a6\u30c0\u30fc<\/a> directly to a home formula unless you have the necessary formulation, preservation and safety controls.<\/p>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"Topical_Hair-Care_Evidence_Is_Not_Oral_Supplement_Evidence\"><\/span>Topical Hair-Care Evidence Is Not Oral Supplement Evidence<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Evidence showing that a peptide fraction can interact with a damaged hair fiber does not prove that taking the same ingredient orally produces the same cosmetic result. Oral keratin peptide products require separate identity, digestibility, dose, safety, contaminant and finished-product evidence.<\/p>\n\n<p>Brands developing ingestible products should evaluate <a href=\"https:\/\/collagensei.com\/ja\/%e3%82%b3%e3%83%a9%e3%83%bc%e3%82%b2%e3%83%b3%e3%83%9a%e3%83%97%e3%83%81%e3%83%89%e5%8d%b8%e5%a3%b2\/%e3%83%90%e3%83%ab%e3%82%af%e5%8a%a0%e6%b0%b4%e5%88%86%e8%a7%a3%e3%82%b1%e3%83%a9%e3%83%81%e3%83%b3%e3%83%9a%e3%83%97%e3%83%81%e3%83%89\/\" target=\"_blank\" rel=\"noopener\">bulk hydrolyzed keratin peptides for supplement products<\/a> as a separate use case and should not transfer topical shampoo or hair-fiber claims to a dietary supplement without relevant substantiation.<\/p>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"How_Formulators_Should_Select_a_Hydrolyzed_Keratin_Grade\"><\/span>How Formulators Should Select a Hydrolyzed Keratin Grade<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"1_Confirm_the_Exact_Ingredient_Identity\"><\/span>1. Confirm the Exact Ingredient Identity<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Do not copy one CAS number across every keratin-derived ingredient. The Cosmetic Ingredient Review assessment lists Hydrolyzed Keratin and Hydrolyzed Hair Keratin as different INCI identities with different definitions and CAS references. For example, CAS 69430-36-0 is associated with Hydrolyzed Hair Keratin, not every generic hydrolyzed keratin product.<\/p>\n\n<h3><span class=\"ez-toc-section\" id=\"2_Define_the_Source_Material\"><\/span>2. Define the Source Material<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>Sheep or goat wool<\/li>\n<li>Bovine hoof or horn<\/li>\n<li>Bird feathers<\/li>\n<li>Other documented animal tissues<\/li>\n<\/ul>\n<p>Request animal-origin, country-of-origin, BSE\/TSE, human-origin exclusion and traceability documents. Human-hair-derived material can face additional market restrictions and should not be treated as equivalent to wool- or feather-derived grades.<\/p>\n\n<h3><span class=\"ez-toc-section\" id=\"3_Review_Molecular-Weight_Distribution\"><\/span>3. Review Molecular-Weight Distribution<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Average molecular weight alone is not always sufficient. Ask for the test method and, where relevant, the distribution of low-, mid- and high-molecular-weight fractions. Smaller peptides and larger film-forming fractions can behave differently on hair.<\/p>\n\n<h3><span class=\"ez-toc-section\" id=\"4_Verify_Active_Content_and_Physical_Properties\"><\/span>4. Verify Active Content and Physical Properties<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>Active solids or protein content<\/li>\n<li>Total nitrogen and calculation method<\/li>\n<li>\u30a2\u30df\u30ce\u9178\u7d44\u6210<\/li>\n<li>\u6c34\u5206\u307e\u305f\u306f\u4e7e\u71e5\u6e1b\u91cf<\/li>\n<li>\u30a2\u30c3\u30b7\u30e5<\/li>\n<li>pH\u3068\u6eb6\u89e3\u5ea6<\/li>\n<li>Color and odor specification<\/li>\n<li>Preservative system for liquid grades<\/li>\n<\/ul>\n\n<h3><span class=\"ez-toc-section\" id=\"5_Check_Contaminants_and_Microbiology\"><\/span>5. Check Contaminants and Microbiology<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<ul>\n<li>Heavy metals, including lead, cadmium, mercury and arsenic<\/li>\n<li>Total aerobic count, yeast and mold<\/li>\n<li>Specified pathogens appropriate to the intended product<\/li>\n<li>Residual processing chemicals when relevant<\/li>\n<li>Foreign matter and batch-to-batch sensory consistency<\/li>\n<\/ul>\n\n<p>For commercial sourcing, request batch-level <a href=\"https:\/\/collagensei.com\/ja\/%e3%82%b9%e3%83%9d%e3%83%bc%e3%83%84%e6%a0%84%e9%a4%8a%e3%83%a1%e3%83%bc%e3%82%ab%e3%83%bc\/%e3%83%90%e3%83%ab%e3%82%af%e5%8a%a0%e6%b0%b4%e5%88%86%e8%a7%a3%e3%82%b1%e3%83%a9%e3%83%81%e3%83%b3%e8%bc%b8%e5%87%ba%e6%a5%ad%e8%80%85\/\" target=\"_blank\" rel=\"noopener\">hydrolyzed keratin raw material specifications<\/a> rather than relying only on marketing descriptions.<\/p>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"Finished-Product_Formulation_Checklist\"><\/span>Finished-Product Formulation Checklist<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<table>\n<thead><tr><th>\u78ba\u8a8d<\/th><th>\u306a\u305c\u91cd\u8981\u306a\u306e\u304b<\/th><th>Recommended Evidence<\/th><\/tr><\/thead>\n<tbody>\n<tr><td>\u6570\u5f0f\u306e\u4e92\u63db\u6027<\/td><td>Proteins can interact with surfactants, cationic conditioners, salts and preservatives<\/td><td>Bench stability, viscosity, pH and appearance data<\/td><\/tr>\n<tr><td>Deposition and sensory feel<\/td><td>Too little may have no measurable effect; too much can create stiffness or residue<\/td><td>Combability, wet\/dry feel and panel testing<\/td><\/tr>\n<tr><td>Preservation<\/td><td>Protein-containing aqueous systems can support microbial growth<\/td><td>Preservative efficacy and microbial limits<\/td><\/tr>\n<tr><td>\u30d1\u30c3\u30b1\u30fc\u30b8\u30f3\u30b0<\/td><td>Air, light and repeated contamination can affect liquid products<\/td><td>Container compatibility and in-use testing<\/td><\/tr>\n<tr><td>Claim support<\/td><td>Ingredient data do not automatically prove finished-product performance<\/td><td>Product-specific instrumental, hair-tress or consumer testing<\/td><\/tr>\n<tr><td>Market compliance<\/td><td>Ingredient identity and origin rules vary by market<\/td><td>INCI review, origin documents and regulatory assessment<\/td><\/tr>\n<\/tbody>\n<\/table>\n\n<p>Teams that need help matching peptide specifications to dosage form, stability and quality requirements can use GENSEI\u2019s <a href=\"https:\/\/collagensei.com\/ja\/%e3%83%aa%e3%82%b5%e3%83%bc%e3%83%81%ef%bc%86%e3%82%a4%e3%83%8e%e3%83%99%e3%83%bc%e3%82%b7%e3%83%a7%e3%83%b3\/\" target=\"_blank\" rel=\"noopener\">research and formulation support<\/a>.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"1000\" height=\"545\" src=\"https:\/\/collagensei.com\/wp-content\/uploads\/2025\/02\/hydrolyzed-keratin-coa-quality-checklist.webp\" alt=\"Hydrolyzed keratin COA and supplier quality checklist\" class=\"wp-image-24239\" srcset=\"https:\/\/collagensei.com\/wp-content\/uploads\/2025\/02\/hydrolyzed-keratin-coa-quality-checklist.webp 1000w, https:\/\/collagensei.com\/wp-content\/uploads\/2025\/02\/hydrolyzed-keratin-coa-quality-checklist-300x164.webp 300w, https:\/\/collagensei.com\/wp-content\/uploads\/2025\/02\/hydrolyzed-keratin-coa-quality-checklist-768x419.webp 768w, https:\/\/collagensei.com\/wp-content\/uploads\/2025\/02\/hydrolyzed-keratin-coa-quality-checklist-18x10.webp 18w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/figure>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"Cosmetic_Claim_and_Labeling_Considerations\"><\/span>Cosmetic Claim and Labeling Considerations<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>In the United States, cosmetic claims must be truthful and not misleading. A shampoo or conditioner can make appearance-focused claims such as \u201chelps hair feel smoother,\u201d \u201cimproves combability\u201d or \u201creduces the appearance of damage\u201d when supported by appropriate evidence. Claims to regrow hair, treat alopecia, repair living follicles or permanently alter body structure can cause a product to be regulated as a drug.<\/p>\n\n<p>Do not describe a cosmetic ingredient or finished product as \u201cFDA approved\u201d or \u201cFDA certified.\u201d With limited exceptions such as certain color additives, cosmetics and cosmetic ingredients do not receive FDA premarket approval. The responsible company must maintain adequate safety substantiation and compliant labeling.<\/p>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"Frequently_Asked_Questions\"><\/span>\u3088\u304f\u3042\u308b\u8cea\u554f<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"What_is_hydrolyzed_keratin_made_of\"><\/span>What is hydrolyzed keratin made of?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>It is made by hydrolyzing keratin-rich animal material, commonly wool, feathers, horn or hoof. The source and process should be confirmed on supplier documentation.<\/p>\n\n<h3><span class=\"ez-toc-section\" id=\"Is_hydrolyzed_keratin_a_protein\"><\/span>Is hydrolyzed keratin a protein?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Yes. It is a mixture of smaller peptides and amino-acid fragments produced from keratin protein.<\/p>\n\n<h3><span class=\"ez-toc-section\" id=\"Does_hydrolyzed_keratin_permanently_repair_hair\"><\/span>Does hydrolyzed keratin permanently repair hair?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>No cosmetic ingredient can restore a dead hair fiber to its original biological state. Hydrolyzed keratin can provide temporary conditioning, surface reinforcement or measurable mechanical benefits in some formulas.<\/p>\n\n<h3><span class=\"ez-toc-section\" id=\"Does_hydrolyzed_keratin_straighten_hair\"><\/span>Does hydrolyzed keratin straighten hair?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>No. It can improve smoothness and manageability, but permanent or semi-permanent straightening depends on a complete treatment system, not hydrolyzed keratin alone.<\/p>\n\n<h3><span class=\"ez-toc-section\" id=\"Is_hydrolyzed_keratin_formaldehyde\"><\/span>Is hydrolyzed keratin formaldehyde?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>No. Hydrolyzed keratin is a protein hydrolysate. Some salon smoothing systems may contain or release formaldehyde-related chemicals, but that is a separate issue involving the full formula.<\/p>\n\n<h3><span class=\"ez-toc-section\" id=\"Is_hydrolyzed_keratin_vegan\"><\/span>Is hydrolyzed keratin vegan?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Usually not. True keratin is animal-derived. Plant-protein products marketed as vegan keratin are keratin alternatives, not animal keratin.<\/p>\n\n<h3><span class=\"ez-toc-section\" id=\"What_is_the_INCI_name\"><\/span>What is the INCI name?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>The common cosmetic INCI name is Hydrolyzed Keratin. Other keratin-derived ingredients have different INCI identities, so brands should confirm the exact material supplied.<\/p>\n\n<h3><span class=\"ez-toc-section\" id=\"What_should_buyers_request_from_a_supplier\"><\/span>What should buyers request from a supplier?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Request the specification, batch COA, exact INCI and CAS identity, source declaration, molecular-weight data, active content, amino-acid profile, microbiology, heavy metals, BSE\/TSE documentation, allergen statement, stability information, MOQ and lead time.<\/p>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>\u7d50\u8ad6<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Hydrolyzed keratin is a versatile protein-conditioning ingredient, but it should not be reduced to the claim that it \u201cpenetrates and permanently repairs hair.\u201d Its real performance depends on the source, molecular-weight distribution, formula system and test method. Consumers should distinguish it from salon straightening treatments, while brands should qualify the exact ingredient identity, safety documentation, contaminants, sensory profile and finished-product evidence before making performance claims.<\/p>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"References\"><\/span>\u53c2\u8003\u6587\u732e<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ol>\n<li><a href=\"https:\/\/journals.sagepub.com\/doi\/full\/10.1177\/10915818211013019\" target=\"_blank\" rel=\"noopener nofollow\">Cosmetic Ingredient Review: Safety Assessment of Keratin and Keratin-Derived Ingredients as Used in Cosmetics<\/a><\/li><li><a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/32946595\/\" target=\"_blank\" rel=\"noopener nofollow\">PubMed: Penetration of Different Molecular Weight Hydrolysed Keratins into Hair Fibres<\/a><\/li><li><a href=\"https:\/\/www.fda.gov\/cosmetics\/cosmetics-labeling\/cosmetics-labeling-claims\" target=\"_blank\" rel=\"noopener nofollow\">FDA\uff1a\u5316\u7ca7\u54c1\u306e\u8868\u793a\u30fb\u52b9\u80fd\u8868\u793a<\/a><\/li><li><a href=\"https:\/\/www.fda.gov\/cosmetics\/cosmetic-products-ingredients\/cosmetic-ingredients\" target=\"_blank\" rel=\"noopener nofollow\">FDA: Cosmetic Ingredients<\/a><\/li><li><a href=\"https:\/\/www.fda.gov\/cosmetics\/cosmetics-laws-regulations\/cosmetics-us-law\" target=\"_blank\" rel=\"noopener nofollow\">FDA: Cosmetics and U.S. Law<\/a><\/li>\n<\/ol>\n\n<p><em>Disclaimer: This article is for ingredient education and product-development reference. It is not medical advice and does not replace a finished-product safety, regulatory or claims review for the intended market.<\/em><\/p>\n<\/article>","protected":false},"excerpt":{"rendered":"<p>Hydrolyzed keratin is keratin protein that has been broken into smaller peptides and amino-acid fragments by acid, enzyme or another [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":4287,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[200],"tags":[325],"class_list":["post-4590","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-hydrolyzed-keratin","tag-keratin-protein"],"_links":{"self":[{"href":"https:\/\/collagensei.com\/ja\/wp-json\/wp\/v2\/posts\/4590","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/collagensei.com\/ja\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/collagensei.com\/ja\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/collagensei.com\/ja\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/collagensei.com\/ja\/wp-json\/wp\/v2\/comments?post=4590"}],"version-history":[{"count":5,"href":"https:\/\/collagensei.com\/ja\/wp-json\/wp\/v2\/posts\/4590\/revisions"}],"predecessor-version":[{"id":24251,"href":"https:\/\/collagensei.com\/ja\/wp-json\/wp\/v2\/posts\/4590\/revisions\/24251"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/collagensei.com\/ja\/wp-json\/wp\/v2\/media\/4287"}],"wp:attachment":[{"href":"https:\/\/collagensei.com\/ja\/wp-json\/wp\/v2\/media?parent=4590"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/collagensei.com\/ja\/wp-json\/wp\/v2\/categories?post=4590"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/collagensei.com\/ja\/wp-json\/wp\/v2\/tags?post=4590"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}