{"id":4117,"date":"2026-07-16T10:17:37","date_gmt":"2026-07-16T02:17:37","guid":{"rendered":"https:\/\/collagensei.com\/?p=4117"},"modified":"2026-07-16T10:17:40","modified_gmt":"2026-07-16T02:17:40","slug":"borretschsamenol-vs-nachtkerzenol","status":"publish","type":"post","link":"https:\/\/collagensei.com\/de\/borage-seed-oil-vs-evening-primrose-oil\/","title":{"rendered":"Borretsch\u00f6l vs. Nachtkerzen\u00f6l: GLA, Sicherheit und Leitfaden zu Softgel-Kapseln"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 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\">Inhalts\u00fcbersicht<\/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=\"Inhaltsverzeichnis umschalten\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Umschalten auf<\/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\/de\/borage-seed-oil-vs-evening-primrose-oil\/#Borage_Seed_Oil_vs_Evening_Primrose_Oil_at_a_Glance\" >Borage Seed Oil vs Evening Primrose Oil at a Glance<\/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\/de\/borage-seed-oil-vs-evening-primrose-oil\/#What_Is_Borage_Seed_Oil\" >What Is Borage Seed Oil?<\/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\/de\/borage-seed-oil-vs-evening-primrose-oil\/#What_Is_Evening_Primrose_Oil\" >Was ist Nachtkerzen\u00f6l?<\/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\/de\/borage-seed-oil-vs-evening-primrose-oil\/#Is_Borage_Oil_the_Same_as_Starflower_Oil\" >Is Borage Oil the Same as Starflower Oil?<\/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\/de\/borage-seed-oil-vs-evening-primrose-oil\/#GLA_Content_Why_Percentage_Alone_Is_Not_Enough\" >GLA Content: Why Percentage Alone Is Not Enough<\/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\/de\/borage-seed-oil-vs-evening-primrose-oil\/#Which_Oil_Is_Better_for_Each_Product_Goal\" >Which Oil Is Better for Each Product Goal?<\/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\/de\/borage-seed-oil-vs-evening-primrose-oil\/#Evidence_and_Health-Claim_Boundaries\" >Evidence and Health-Claim Boundaries<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/collagensei.com\/de\/borage-seed-oil-vs-evening-primrose-oil\/#Skin_and_Eczema\" >Skin and Eczema<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/collagensei.com\/de\/borage-seed-oil-vs-evening-primrose-oil\/#PMS_Menopause_and_%E2%80%9CHormone_Balance%E2%80%9D\" >PMS, Menopause and \u201cHormone Balance\u201d<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/collagensei.com\/de\/borage-seed-oil-vs-evening-primrose-oil\/#Inflammation_Joints_and_Other_Conditions\" >Inflammation, Joints and Other Conditions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/collagensei.com\/de\/borage-seed-oil-vs-evening-primrose-oil\/#Weight_and_Estrogen_Questions\" >Weight and Estrogen Questions<\/a><\/li><\/ul><\/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\/de\/borage-seed-oil-vs-evening-primrose-oil\/#Safety_Pyrrolizidine_Alkaloids_and_Borage_Oil\" >Safety: Pyrrolizidine Alkaloids and Borage Oil<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/collagensei.com\/de\/borage-seed-oil-vs-evening-primrose-oil\/#General_Safety_and_Interaction_Review\" >General Safety and Interaction Review<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/collagensei.com\/de\/borage-seed-oil-vs-evening-primrose-oil\/#Softgel_Formulation_Considerations\" >Softgel Formulation Considerations<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/collagensei.com\/de\/borage-seed-oil-vs-evening-primrose-oil\/#Quality_Specification_Checklist\" >Checkliste f\u00fcr Qualit\u00e4tsspezifikationen<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/collagensei.com\/de\/borage-seed-oil-vs-evening-primrose-oil\/#RFP_Questions_for_an_Oil_Supplier_or_Softgel_Manufacturer\" >RFP Questions for an Oil Supplier or Softgel Manufacturer<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/collagensei.com\/de\/borage-seed-oil-vs-evening-primrose-oil\/#Frequently_Asked_Questions\" >H\u00e4ufig gestellte Fragen<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/collagensei.com\/de\/borage-seed-oil-vs-evening-primrose-oil\/#Which_is_better_borage_oil_or_evening_primrose_oil\" >Was ist besser, Borretsch\u00f6l oder Nachtkerzen\u00f6l?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/collagensei.com\/de\/borage-seed-oil-vs-evening-primrose-oil\/#Can_you_take_borage_oil_and_evening_primrose_oil_together\" >Kann man Borretsch\u00f6l und Nachtkerzen\u00f6l zusammen einnehmen?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/collagensei.com\/de\/borage-seed-oil-vs-evening-primrose-oil\/#Does_borage_oil_increase_estrogen\" >Does borage oil increase estrogen?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/collagensei.com\/de\/borage-seed-oil-vs-evening-primrose-oil\/#Does_borage_oil_cause_weight_gain\" >Verursacht Borretsch\u00f6l eine Gewichtszunahme?<\/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\/de\/borage-seed-oil-vs-evening-primrose-oil\/#What_should_%E2%80%9CPA-free_borage_oil%E2%80%9D_mean\" >What should \u201cPA-free borage oil\u201d mean?<\/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\/de\/borage-seed-oil-vs-evening-primrose-oil\/#Is_cold-pressed_oil_always_better\" >Is cold-pressed oil always better?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/collagensei.com\/de\/borage-seed-oil-vs-evening-primrose-oil\/#Final_Takeaway\" >Letzte Erkenntnis<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-25\" href=\"https:\/\/collagensei.com\/de\/borage-seed-oil-vs-evening-primrose-oil\/#References\" >Referenzen<\/a><\/li><\/ul><\/nav><\/div>\n\nBorage seed oil usually contains more gamma-linolenic acid (GLA) per gram than evening primrose oil, so it may reach the same formulated GLA amount with less oil. That does not prove stronger clinical effects. Borage oil also needs documented pyrrolizidine alkaloid control, while both oils require fatty-acid, oxidation, contaminant and stability specifications.<\/p>\n \n<p>This guide is for consumers, formulators, supplement brands and procurement teams comparing these oils for softgels or other dietary supplement products. It does not present either oil as a treatment for eczema, PMS, menopause, arthritis, asthma, diabetes, weight loss or another medical condition.<\/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\/08\/borage-seed-oil-vs-evening-primrose-oil-comparison-1.webp\" alt=\"Borage seed oil vs evening primrose oil comparison by GLA, PA safety and softgel use\" class=\"wp-image-23565\" srcset=\"https:\/\/collagensei.com\/wp-content\/uploads\/2025\/08\/borage-seed-oil-vs-evening-primrose-oil-comparison-1.webp 1000w, https:\/\/collagensei.com\/wp-content\/uploads\/2025\/08\/borage-seed-oil-vs-evening-primrose-oil-comparison-1-300x164.webp 300w, https:\/\/collagensei.com\/wp-content\/uploads\/2025\/08\/borage-seed-oil-vs-evening-primrose-oil-comparison-1-768x419.webp 768w, https:\/\/collagensei.com\/wp-content\/uploads\/2025\/08\/borage-seed-oil-vs-evening-primrose-oil-comparison-1-18x10.webp 18w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/figure>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"Borage_Seed_Oil_vs_Evening_Primrose_Oil_at_a_Glance\"><\/span>Borage Seed Oil vs Evening Primrose Oil at a Glance<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<div class=\"table-wrap\" style=\"overflow-x:auto;\">\n<table>\n<thead><tr><th>Faktor<\/th><th>Borretschsamen-\u00d6l<\/th><th>Nachtkerzen\u00f6l<\/th><\/tr><\/thead>\n<tbody>\n<tr><td>Botanische Quelle<\/td><td><em>Borago officinalis<\/em> seed; also marketed as <a class=\"wpil_keyword_link\" href=\"https:\/\/collagensei.com\/de\/hydrolysiertes-keratin-und-borretschol-synergetische-vorteile-fur-gesundheit-und-schonheit\/\" target=\"_blank\"  rel=\"noopener\" title=\"Borretsch\u00f6l VS Nachtkerzen\u00f6l\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"3798\">Sternblumen\u00f6l<\/a><\/td><td><em>Oenothera biennis<\/em> seed<\/td><\/tr>\n<tr><td>Typical GLA specification<\/td><td>Often approximately 18%\u201326%, depending on cultivar, process and lot specification<\/td><td>Often approximately 7%\u201310%, depending on cultivar, process and lot specification<\/td><\/tr>\n<tr><td>Oil required for the same GLA target<\/td><td>Usually less<\/td><td>Usually more<\/td><\/tr>\n<tr><td>Distinctive safety\/quality issue<\/td><td>Documented control and testing of relevant pyrrolizidine alkaloids<\/td><td>No borage-specific PA issue, but normal identity, oxidation and contaminant controls still apply<\/td><\/tr>\n<tr><td>Commercial advantage<\/td><td>Higher GLA concentration can reduce fill weight<\/td><td>Strong consumer recognition and established market positioning<\/td><\/tr>\n<tr><td>Key formulation risks<\/td><td>PA documentation, oxidation, source variation, odor and softgel stability<\/td><td>Oxidation, GLA variability, larger fill weight and softgel stability<\/td><\/tr>\n<\/tbody><\/table><\/div>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"What_Is_Borage_Seed_Oil\"><\/span>What Is Borage Seed Oil?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Borage seed oil is extracted from the seeds of <em>Borago officinalis<\/em>. Starflower oil is a common market name for the same seed oil. Its main formulation value is its relatively high GLA content.<\/p>\n<p>In supplement specifications, \u201cborage oil\u201d should identify the botanical name, seed as the plant part, extraction and refining process, country of origin, fatty-acid profile and lot-specific quality results. It should not be confused with borage leaf, flower or crude herbal preparations.<\/p>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"What_Is_Evening_Primrose_Oil\"><\/span>Was ist Nachtkerzen\u00f6l?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><a class=\"wpil_keyword_link\" href=\"https:\/\/collagensei.com\/de\/nachtkerzenol-vs-dha-ol\/\" target=\"_blank\"  rel=\"noopener\" title=\"Nachtkerzen\u00f6l VS DHA Algen\u00f6l\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"3799\">Nachtkerze<\/a> oil is extracted from the seeds of <em>Oenothera biennis<\/em>. It contains linoleic acid and a smaller GLA fraction than most commercial borage seed oils. It is widely sold in liquid oil and softgel formats.<\/p>\n<p>Consumer familiarity does not establish effectiveness for a health condition. The finished product still requires a verified fatty-acid profile, oxidation controls, stability data and claims review.<\/p>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"Is_Borage_Oil_the_Same_as_Starflower_Oil\"><\/span>Is Borage Oil the Same as Starflower Oil?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Yes. \u201cStarflower oil\u201d commonly refers to borage seed oil. A marketing name is not enough for purchasing, however. Procurement documents should still specify <em>Borago officinalis<\/em>, seed oil, extraction\/refining process and the required GLA and PA specifications.<\/p>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"GLA_Content_Why_Percentage_Alone_Is_Not_Enough\"><\/span>GLA Content: Why Percentage Alone Is Not Enough<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>A higher GLA percentage means that less total oil may be needed to deliver the same formulated GLA amount. It does not prove that the oil works faster, produces stronger clinical outcomes or is better for a specific disease.<\/p>\n<div class=\"table-wrap\" style=\"overflow-x:auto;\">\n<table>\n<thead><tr><th>Formulation Example<\/th><th>Oil at 20% GLA<\/th><th>Oil at 9% GLA<\/th><\/tr><\/thead>\n<tbody>\n<tr><td>100 mg formulated GLA<\/td><td>500 mg oil<\/td><td>Approximately 1,111 mg oil<\/td><\/tr>\n<tr><td>200 mg formulated GLA<\/td><td>1,000 mg oil<\/td><td>Approximately 2,222 mg oil<\/td><\/tr>\n<tr><td>Softgel implication<\/td><td>Potentially smaller fill or fewer units<\/td><td>Larger fill or more units may be required<\/td><\/tr>\n<\/tbody><\/table><\/div>\n<p>These calculations are formulation examples, not consumer dose recommendations. Use the actual lot-specific fatty-acid result and account for overages, fill-weight tolerance, serving count and shelf-life changes.<\/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\/08\/borage-evening-primrose-gla-fill-weight-calculation.webp\" alt=\"Oil fill needed for the same GLA amount from borage and evening primrose oil\" class=\"wp-image-23567\" srcset=\"https:\/\/collagensei.com\/wp-content\/uploads\/2025\/08\/borage-evening-primrose-gla-fill-weight-calculation.webp 1000w, https:\/\/collagensei.com\/wp-content\/uploads\/2025\/08\/borage-evening-primrose-gla-fill-weight-calculation-300x164.webp 300w, https:\/\/collagensei.com\/wp-content\/uploads\/2025\/08\/borage-evening-primrose-gla-fill-weight-calculation-768x419.webp 768w, https:\/\/collagensei.com\/wp-content\/uploads\/2025\/08\/borage-evening-primrose-gla-fill-weight-calculation-18x10.webp 18w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/figure>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"Which_Oil_Is_Better_for_Each_Product_Goal\"><\/span>Which Oil Is Better for Each Product Goal?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<div class=\"table-wrap\" style=\"overflow-x:auto;\">\n<table>\n<thead><tr><th>Produkt-Ziel<\/th><th>Likely Starting Option<\/th><th>Grund<\/th><\/tr><\/thead>\n<tbody>\n<tr><td>Higher GLA in a smaller oil fill<\/td><td>Borage seed oil with qualified PA documentation<\/td><td>Higher GLA concentration may reduce total fill weight<\/td><\/tr>\n<tr><td>Familiar consumer-facing women\u2019s wellness softgel<\/td><td>Nachtkerzen\u00f6l<\/td><td>Established ingredient recognition, subject to conservative claims<\/td><\/tr>\n<tr><td>Low-oxidation premium softgel<\/td><td>Either oil meeting the full oxidation and stability specification<\/td><td>Freshness and packaging are more important than the ingredient name alone<\/td><\/tr>\n<tr><td>PA-sensitive market or buyer<\/td><td>Evening primrose oil, or borage oil with validated lot-level PA results<\/td><td>Reduces ambiguity in supplier qualification<\/td><\/tr>\n<tr><td>Combined GLA oil formula<\/td><td>Only with a clear formulation rationale<\/td><td>Combining similar oils may duplicate GLA without adding meaningful differentiation<\/td><\/tr>\n<\/tbody><\/table><\/div>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"Evidence_and_Health-Claim_Boundaries\"><\/span>Evidence and Health-Claim Boundaries<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Skin_and_Eczema\"><\/span>Skin and Eczema<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Oral evening primrose oil and borage oil have been studied for eczema, but a Cochrane review found no clinically useful benefit compared with placebo. Do not market either oil as an eczema, psoriasis, rosacea or acne treatment.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"PMS_Menopause_and_%E2%80%9CHormone_Balance%E2%80%9D\"><\/span>PMS, Menopause and \u201cHormone Balance\u201d<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Evening primrose oil is frequently marketed for PMS and menopause, but authoritative reviews describe the evidence as insufficient or inconclusive. \u201cBalances hormones\u201d is vague and may imply treatment. Use only specific, substantiated structure\/function language.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Inflammation_Joints_and_Other_Conditions\"><\/span>Inflammation, Joints and Other Conditions<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>GLA participates in fatty-acid metabolism, but that fact alone does not support claims to treat arthritis, asthma, neuropathy, chronic pain or cardiovascular disease. Research must match the exact ingredient, dose, population and finished formula.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Weight_and_Estrogen_Questions\"><\/span>Weight and Estrogen Questions<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Neither oil is established as a weight-loss, belly-fat or estrogen-increasing supplement. These questions should be answered directly without suggesting a predictable hormonal or body-composition effect.<\/p>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"Safety_Pyrrolizidine_Alkaloids_and_Borage_Oil\"><\/span>Safety: Pyrrolizidine Alkaloids and Borage Oil<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Borage plants can contain toxic unsaturated pyrrolizidine alkaloids. Processing and refining can reduce contaminants, but \u201cPA-free\u201d should not be accepted as an undefined sales phrase. Buyers need a method, analyte panel, reporting limit and lot-specific result.<\/p>\n<ul>\n<li>Specify the target PA and PA-N-oxide analytes included in the panel.<\/li>\n<li>Request the analytical method and validation or laboratory scope.<\/li>\n<li>Record the limit of detection and limit of quantification.<\/li>\n<li>Require a lot-specific numerical result or clearly defined \u201cnot detected\u201d result.<\/li>\n<li>Match the release specification to the target market and intended daily exposure.<\/li>\n<li>Maintain traceability from seed source through refined oil and finished product.<\/li>\n<\/ul>\n<p>Brands sourcing oil can review a qualified <a href=\"https:\/\/collagensei.com\/de\/spezialitaten-inhaltsstoffe\/borretschol-erganzung\/\" target=\"_blank\" rel=\"noopener\">borage oil ingredient specification<\/a>, but the actual purchase decision must use current batch documents rather than website language.<\/p>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"General_Safety_and_Interaction_Review\"><\/span>General Safety and Interaction Review<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ul>\n<li>Both oils may cause gastrointestinal effects such as nausea, loose stools or abdominal discomfort.<\/li>\n<li>People taking prescription medicines, especially medicines affecting bleeding or seizure control, should ask a healthcare professional before use.<\/li>\n<li>Pregnancy and breastfeeding require product-specific professional review; do not rely on a generic \u201csafe\u201d statement.<\/li>\n<li>People with liver disease, seizure disorders, upcoming surgery or complex medical conditions should seek individualized advice.<\/li>\n<li>Combining the two oils may duplicate GLA exposure without proven additional benefit.<\/li>\n<\/ul>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"Softgel_Formulation_Considerations\"><\/span>Softgel Formulation Considerations<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Both oils fit <a class=\"wpil_keyword_link\" href=\"https:\/\/collagensei.com\/de\/was-sind-flussigkeitsgefullte-hartkapseln\/\" target=\"_blank\"  rel=\"noopener\" title=\"Was sind fl\u00fcssigkeitsgef\u00fcllte Hartkapseln?\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"3797\">fl\u00fcssigkeitsgef\u00fcllt<\/a> softgel systems. A higher GLA percentage can reduce fill weight, but oxidation control and shell compatibility determine whether the product remains stable and acceptable.<\/p>\n<ul>\n<li>Verify the lot-specific fatty-acid profile and GLA percentage.<\/li>\n<li>Set peroxide value, p-anisidine value and TOTOX limits where appropriate.<\/li>\n<li>Review acid value, moisture, odor, color and clarity.<\/li>\n<li>Define antioxidant additions and processing aids.<\/li>\n<li>Control oxygen exposure with suitable handling, nitrogen and headspace strategy.<\/li>\n<li>Test shell-fill compatibility, leakage, seam quality and migration.<\/li>\n<li>Use light- and oxygen-barrier packaging.<\/li>\n<li>Run real-time and accelerated stability in the final package.<\/li>\n<\/ul>\n<p>For dosage-form development, see GENSEI\u2019s <a href=\"https:\/\/collagensei.com\/de\/hersteller-von-softgel-kapseln\/\" target=\"_blank\" rel=\"noopener\">Herstellung von Softgel-Kapseln<\/a> F\u00e4higkeiten.<\/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\/08\/gla-oil-softgel-oxidation-stability-process.webp\" alt=\"Borage and evening primrose oil softgel oxidation, filling and stability controls\" class=\"wp-image-23569\" srcset=\"https:\/\/collagensei.com\/wp-content\/uploads\/2025\/08\/gla-oil-softgel-oxidation-stability-process.webp 1000w, https:\/\/collagensei.com\/wp-content\/uploads\/2025\/08\/gla-oil-softgel-oxidation-stability-process-300x164.webp 300w, https:\/\/collagensei.com\/wp-content\/uploads\/2025\/08\/gla-oil-softgel-oxidation-stability-process-768x419.webp 768w, https:\/\/collagensei.com\/wp-content\/uploads\/2025\/08\/gla-oil-softgel-oxidation-stability-process-18x10.webp 18w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/figure>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"Quality_Specification_Checklist\"><\/span>Checkliste f\u00fcr Qualit\u00e4tsspezifikationen<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<div class=\"table-wrap\" style=\"overflow-x:auto;\">\n<table>\n<thead><tr><th>Qualit\u00e4tsbereich<\/th><th>Was ist zu \u00fcberpr\u00fcfen?<\/th><th>Warum es wichtig ist<\/th><\/tr><\/thead>\n<tbody>\n<tr><td>Botanische Identit\u00e4t<\/td><td>Species, seed as plant part, origin and process<\/td><td>Confirms the correct ingredient<\/td><\/tr>\n<tr><td>Fatty-acid profile<\/td><td>GLA, linoleic acid, oleic acid and other major fatty acids<\/td><td>Verifies identity and formulated potency<\/td><\/tr>\n<tr><td>PA control for borage<\/td><td>Method, analytes, LOD\/LOQ, lot result and release limit<\/td><td>Controls the distinctive borage safety risk<\/td><\/tr>\n<tr><td>Oxidation<\/td><td>Peroxide value, p-anisidine value and TOTOX where appropriate<\/td><td>Supports freshness and shelf-life decisions<\/td><\/tr>\n<tr><td>Other contaminants<\/td><td>Pesticides, heavy metals, residual solvents and microbiology as applicable<\/td><td>Supports ingredient release and market compliance<\/td><\/tr>\n<tr><td>Physikalische Eigenschaften<\/td><td>Color, odor, clarity, density and viscosity<\/td><td>Affects filling, sensory quality and consistency<\/td><\/tr>\n<tr><td>Added materials<\/td><td>Tocopherols, antioxidants, carriers and processing aids<\/td><td>Ensures complete formula and label review<\/td><\/tr>\n<tr><td>Dokumentation<\/td><td>Lot COA, specification, TDS\/SDS, traceability and change control<\/td><td>Supports supplier qualification and audit readiness<\/td><\/tr>\n<tr><td>Finished product<\/td><td>Fill weight, leaks, disintegration, stability and packaging compatibility<\/td><td>Raw-oil quality alone does not assure softgel quality<\/td><\/tr>\n<\/tbody><\/table><\/div>\n<p>Connect raw-material release criteria to finished-product <a href=\"https:\/\/collagensei.com\/de\/qualitatskontrolle-der-beilagen\/\" target=\"_blank\" rel=\"noopener\">Qualit\u00e4tskontrolle der Beilagen<\/a> and documented change-control procedures.<\/p>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"RFP_Questions_for_an_Oil_Supplier_or_Softgel_Manufacturer\"><\/span>RFP Questions for an Oil Supplier or Softgel Manufacturer<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ol>\n<li>What botanical species, plant part and country of origin apply?<\/li>\n<li>Is the oil cold-pressed, solvent-extracted, refined, deodorized or otherwise processed?<\/li>\n<li>What minimum and typical GLA percentages are guaranteed?<\/li>\n<li>Can you provide three recent lot-specific fatty-acid profiles and COAs?<\/li>\n<li>For borage oil, which PA and PA-N-oxide analytes are tested?<\/li>\n<li>What method, laboratory, LOD, LOQ and release limit are used for PA testing?<\/li>\n<li>What are the peroxide, p-anisidine, TOTOX and acid-value specifications?<\/li>\n<li>Which antioxidants, carriers or processing aids are present?<\/li>\n<li>What pesticide, heavy-metal, residual-solvent and microbiological tests are included?<\/li>\n<li>What packaging, storage and shelf-life conditions are supported?<\/li>\n<li>What are the MOQ, sample quantity, lead time and change-control terms?<\/li>\n<li>Can the manufacturer support pilot softgels and final-package stability?<\/li>\n<li>How are skin, women\u2019s-health, inflammation and hormone-related claims reviewed?<\/li>\n<\/ol>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"Frequently_Asked_Questions\"><\/span>H\u00e4ufig gestellte Fragen<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Which_is_better_borage_oil_or_evening_primrose_oil\"><\/span>Was ist besser, Borretsch\u00f6l oder Nachtkerzen\u00f6l?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Borage oil is usually more concentrated in GLA and may require less oil for the same formulated GLA amount. Evening primrose oil may be preferred for consumer familiarity. The better ingredient is the one that meets the required safety, oxidation, stability and documentation specifications.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Can_you_take_borage_oil_and_evening_primrose_oil_together\"><\/span>Kann man Borretsch\u00f6l und Nachtkerzen\u00f6l zusammen einnehmen?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>They provide overlapping fatty acids, so combining them may duplicate GLA exposure without proven additional benefit. A healthcare professional should review the total formula and medicines.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Does_borage_oil_increase_estrogen\"><\/span>Does borage oil increase estrogen?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>There is no reliable evidence that borage oil predictably increases estrogen. Do not market it as a hormone treatment.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Does_borage_oil_cause_weight_gain\"><\/span>Verursacht Borretsch\u00f6l eine Gewichtszunahme?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>No good evidence shows a specific weight-gain effect. Like all oils, it provides calories, but body weight depends on the overall diet and many other factors.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"What_should_%E2%80%9CPA-free_borage_oil%E2%80%9D_mean\"><\/span>What should \u201cPA-free borage oil\u201d mean?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>It should mean that a defined analytical panel was tested using a documented method and reporting limit, with a lot-specific result that meets the buyer\u2019s release specification. A marketing phrase alone is insufficient.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Is_cold-pressed_oil_always_better\"><\/span>Is cold-pressed oil always better?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>No. Cold pressing may support a particular source story, but refining or deodorization may be needed to control odor, contaminants or stability. Quality should be judged by the complete specification and batch results.<\/p>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"Final_Takeaway\"><\/span>Letzte Erkenntnis<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Borage seed oil and evening primrose oil are both GLA-containing seed oils, but a higher GLA percentage is a formulation advantage\u2014not proof of superior clinical results. Responsible selection requires verified fatty-acid profiles, PA control for borage oil, oxidation limits, softgel compatibility, final-package stability and conservative claims.<\/p>\n<p>Marken k\u00f6nnen <a href=\"https:\/\/collagensei.com\/de\/kontaktieren-sie-uns\/\" target=\"_blank\" rel=\"noopener\">Kontaktieren Sie GENSEI<\/a> with the target GLA amount, PA specification, dosage form, package, market and order quantity to request a sample, COA or quotation.<\/p>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"References\"><\/span>Referenzen<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<ol>\n<li><a href=\"https:\/\/www.nccih.nih.gov\/health\/evening-primrose-oil\" target=\"_blank\" rel=\"noopener nofollow\">NCCIH: Evening Primrose Oil\u2014Usefulness and Safety<\/a><\/li><li><a href=\"https:\/\/www.nccih.nih.gov\/health\/providers\/digest\/skin-conditions-and-complementary-health-approaches-science\" target=\"_blank\" rel=\"noopener nofollow\">NCCIH: Skin Conditions and Complementary Health Approaches\u2014What the Science Says<\/a><\/li><li><a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/23633319\/\" target=\"_blank\" rel=\"noopener nofollow\">PubMed: Oral Evening Primrose Oil and Borage Oil for Eczema\u2014Cochrane Review<\/a><\/li><li><a href=\"https:\/\/www.ema.europa.eu\/en\/use-herbal-medicinal-products-containing-toxic-unsaturated-pyrrolizidine-alkaloids-pas-scientific-guideline\" target=\"_blank\" rel=\"noopener nofollow\">EMA: Pyrrolizidine Alkaloids in Herbal Medicinal Products\u2014Scientific Guideline<\/a><\/li><li><a href=\"https:\/\/www.efsa.europa.eu\/en\/efsajournal\/pub\/4908\" target=\"_blank\" rel=\"noopener nofollow\">EFSA: Risks for Human Health Related to Pyrrolizidine Alkaloids in Food<\/a><\/li><li><a href=\"https:\/\/www.fda.gov\/food\/nutrition-food-labeling-and-critical-foods\/structurefunction-claims\" target=\"_blank\" rel=\"noopener nofollow\">FDA: Angaben zu Struktur und Funktion<\/a><\/li><li><a href=\"https:\/\/www.ftc.gov\/business-guidance\/resources\/health-products-compliance-guidance\" target=\"_blank\" rel=\"noopener nofollow\">FTC: Leitfaden zur Einhaltung der Vorschriften f\u00fcr Gesundheitsprodukte<\/a><\/li><li><a href=\"https:\/\/www.ecfr.gov\/current\/title-21\/chapter-I\/subchapter-B\/part-111\" target=\"_blank\" rel=\"noopener nofollow\">21 CFR Teil 111: Aktuelle gute Herstellungspraxis f\u00fcr Nahrungserg\u00e4nzungsmittel<\/a><\/li>\n<\/ol>\n<\/article>","protected":false},"excerpt":{"rendered":"<p>Borage seed oil usually contains more gamma-linolenic acid (GLA) per gram than evening primrose oil, so it may reach the [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":10996,"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 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center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[311,312],"tags":[314,438,424,439,270,313,133,197,364],"class_list":["post-4117","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-borage-oil","category-evening-primrose-oil","tag-borage-oil","tag-borage-oil-supplement","tag-capsule-supplement-manufacturing","tag-custom-formula","tag-dietary-supplement-ingredients","tag-evening-primrose-oil","tag-food-supplement-ingredients","tag-oem-solutions","tag-packaging-services"],"_links":{"self":[{"href":"https:\/\/collagensei.com\/de\/wp-json\/wp\/v2\/posts\/4117","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/collagensei.com\/de\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/collagensei.com\/de\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/collagensei.com\/de\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/collagensei.com\/de\/wp-json\/wp\/v2\/comments?post=4117"}],"version-history":[{"count":2,"href":"https:\/\/collagensei.com\/de\/wp-json\/wp\/v2\/posts\/4117\/revisions"}],"predecessor-version":[{"id":23572,"href":"https:\/\/collagensei.com\/de\/wp-json\/wp\/v2\/posts\/4117\/revisions\/23572"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/collagensei.com\/de\/wp-json\/wp\/v2\/media\/10996"}],"wp:attachment":[{"href":"https:\/\/collagensei.com\/de\/wp-json\/wp\/v2\/media?parent=4117"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/collagensei.com\/de\/wp-json\/wp\/v2\/categories?post=4117"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/collagensei.com\/de\/wp-json\/wp\/v2\/tags?post=4117"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}