L'enveloppe de la capsule est distincte du contenu qu'elle renferme. Le contenu peut contenir des vitamines, des minéraux, des extraits végétaux, des acides aminés, des probiotiques, des huiles, des poudres, des granulés, des microbilles et des excipients. Pour un aperçu plus complet des formats, des avantages et des critères de sélection, consultez notre Guide des compléments alimentaires en gélules.
Enveloppe de la capsule ou contenu de la capsule : que regardez-vous réellement ?
Un produit sous forme de gélules comporte généralement deux systèmes d'ingrédients :
- Le shell : l'enveloppe externe comestible, généralement composée de gélatine, d'HPMC, de pullulane, ou d'un système spécial de gélules molles ou à libération prolongée.
- Le contenu : les ingrédients alimentaires actifs ainsi que les excipients nécessaires pour assurer la fluidité, l'uniformité, la stabilité, la transformation ou la libération.
Cette distinction est importante lors de la lecture d'une étiquette. Le tableau « Informations nutritionnelles » répertorie les ingrédients alimentaires, tandis que la liste des ingrédients identifie généralement les matériaux d'enveloppe et autres ingrédients qui ne sont pas mentionnés dans le tableau « Informations nutritionnelles ». Selon la formule, l'étiquette peut mentionner des termes tels que gélatine, hypromellose, glycérine, eau purifiée, farine de riz, dioxyde de silicium, stéarate de magnésium, colorants ou autres excipients.
Comparaison des principaux matériaux utilisés pour l'enveloppe des capsules
| Enveloppe de la capsule | Matériau principal | Sans composants d'origine animale ? | Formulation type adaptée | Vérifications essentielles |
|---|---|---|---|---|
| Gélule dure en gélatine | Gélatine dérivée du collagène, généralement d'origine bovine ou porcine ; il existe également de la gélatine de poisson | Non | Formules générales pour les poudres, les granulés et les microbilles | Origine de l'espèce, compatibilité en matière d'humidité, risque de réticulation, documentation halal/casher |
| Gélu en HPMC | L'hypromellose, un éther de cellulose | Généralement présenté comme ne provenant pas d'animaux | Produits destinés aux végétariens ou aux végétaliens, ainsi que de nombreuses garnitures sensibles à l'humidité | Composition des fournisseurs, système gélifiant, dissolution, certification, compatibilité de remplissage |
| Gélule rigide à base de pullulane | Polysaccharide issu de la fermentation | Généralement présenté comme ne provenant pas d'animaux | Produits haut de gamme d'origine végétale et formules sélectionnées sensibles à l'oxygène | Données relatives aux barrières, disponibilité, coût, champ d'application de la certification, conditionnement et essais de stabilité |
| Gélu classique | Généralement de la gélatine, de l'eau et un plastifiant tel que la glycérine ou le sorbitol | En général, non | Huiles, suspensions et certains produits de remplissage liquides ou semi-solides | Système de plastifiants, intégrité des soudures, interaction entre la matière de remplissage et l'enveloppe, migration de l'humidité |
| Gélule sans origine animale | Amidon, carraghénane, cellulose modifiée ou autres systèmes à base de polysaccharides propres à chaque fournisseur | En principe, sous réserve de la présentation des pièces justificatives | Huiles végétales et produits liquides | Technologie des fournisseurs, délai de traitement, stabilité, certification, règles du marché cible |
| Gélu à libération prolongée | Polymère de revêtement spécialisé ou système de revêtement | Cela dépend du système | Formules conçues pour une libération au-delà de l'estomac | Méthode de dissolution validée, libellé de l'étiquette, conditions de conservation et mode d'emploi |
Capsules de gélatine
De quoi est composée une gélule en gélatine ?
La gélatine est une protéine issue de tissus animaux contenant du collagène. La gélatine destinée à la fabrication de gélules provient généralement de matières premières bovines ou porcines, bien que de la gélatine d’origine piscicole soit disponible pour certains produits spécialisés. L’origine doit être vérifiée à l’aide du cahier des charges du fournisseur de gélules, des documents de traçabilité et de tout certificat religieux ou alimentaire pertinent. Une mention générique “ gélatine ” ne permet pas, à elle seule, d’identifier l’espèce animale.
Les gélules en gélatine dure sont généralement constituées de deux parties, fabriquées à partir de gélatine et d'eau. Les formulations des fournisseurs peuvent également inclure des colorants autorisés, des agents opacifiants ou des adjuvants technologiques. Les gélules souples sont différentes : elles nécessitent un plastifiant pour conserver leur souplesse et sont moulées, remplies et scellées en une seule opération. Pour une explication plus détaillée sur les matériaux et le contrôle qualité, consultez Comment sont fabriquées les enveloppes des gélules en gélatine ?.
Avantages et limites de la gélatine
- Performances de fabrication éprouvées : La gélatine est largement utilisée et donne de bons résultats sur de nombreuses lignes d'encapsulation à grande vitesse.
- Prix et disponibilité : it is often more economical than specialty plant-based shell systems.
- Dietary restrictions: it is not suitable for vegan or vegetarian products, and halal or kosher suitability requires appropriate sourcing and certification.
- Environmental sensitivity: shell behavior can change under very dry, humid, or hot conditions.
- Compatibilité de la formule : some fills can interact with gelatin or promote cross-linking, so dissolution and stability testing are important.
HPMC Vegetarian Capsules
What Is HPMC?
HPMC stands for hydroxypropyl methylcellulose and is also called hypromellose. It is a cellulose ether manufactured from purified cellulose through controlled chemical modification. The resulting material is used to form non-animal hard capsule shells. Although the cellulose source is plant-derived, claims such as vegan, non-GMO, halal, or kosher should still be supported by supplier documentation and certification rather than assumed from the material name alone.
HPMC and Moisture-Sensitive Formulas
HPMC shells commonly have a lower equilibrium moisture range than gelatin shells, which can make them useful for some hygroscopic or moisture-sensitive ingredients. This does not mean HPMC is automatically superior for every formula. Shell performance depends on the capsule supplier, gelling system, fill composition, storage humidity, packaging, and dissolution requirements. Compare these factors in our gelatin vs. HPMC formulation guide.
Brands should confirm shell moisture specifications, brittleness risk, dissolution behavior, compatibility with hygroscopic ingredients, and performance after accelerated and real-time stability testing.
Pullulan and Other Plant-Based Capsules
What Is Pullulan?
Pullulan is a water-soluble polysaccharide made by microbial fermentation. It can be formed into clear, plant-based capsule shells and is often used for premium positioning. Pullulan may provide useful oxygen-barrier properties, but the practical protection of a finished supplement also depends on shell thickness, fill chemistry, headspace, bottle material, closure, desiccant or oxygen absorber, and storage conditions. Do not rely on one universal barrier multiple without supplier-specific test data.
Does Pullulan Make a Product USDA Organic?
No capsule material automatically makes a finished product “100% organic” or “organic.” USDA rules allow pullulan for organic handling in products labeled “Made with organic (specified ingredients or food group(s)),” subject to the National Organic Program and certifier review. The finished product’s ingredients, percentages, processing aids, records, facility controls, and label must meet the applicable certification category. Obtain written approval from the organic certifier before finalizing claims or packaging.
Other non-animal hard capsule systems may use starches, carrageenan, gellan gum, modified cellulose, or blends of polysaccharides. Their composition and processing behavior are supplier-specific, so the common or usual ingredient names and technical documents should be reviewed before using broad terms such as “vegetable capsule.”
Hard Capsules vs. Softgels vs. Delayed-Release Capsules
| Format | Structure | Common fill | Important limitation |
|---|---|---|---|
| Two-piece hard capsule | Separate cap and body | Powders, granules, pellets, beadlets, and selected non-aqueous fills | Not every formula can be opened or mixed into food; check product instructions |
| Gélule | One-piece, flexible, hermetically sealed shell | Oils, suspensions, and selected liquid or semi-solid systems | Fill and shell can exchange moisture or plasticizer, affecting stability |
| Gélu à libération prolongée | Specialized shell or coated system | Ingredients intended for delayed release or protection from stomach conditions | Do not open, crush, or chew unless the product manufacturer confirms that it is appropriate |
What Else Can Be in a Capsule Shell?
Water, Plasticizers, and Gelling Agents
Water is used during shell formation and remains at a controlled level in many finished shells. Softgels normally contain a plasticizer such as glycerin or sorbitol to keep the shell flexible. Some HPMC or plant-based capsule technologies use gelling agents or salts to support film formation. Exact compositions vary by supplier.
Colorants et agents opacifiants
Capsules may be clear, naturally colored, synthetically colored, or opaque. Colors can support product identification and branding, while opacity can reduce light exposure or hide an unattractive fill. A clear capsule is not necessarily additive-free, and an opaque capsule does not reveal which opacifier was used. Review the supplier’s complete composition and the finished label.
Titanium dioxide requirements differ by market. It remains permitted under applicable U.S. color-additive rules when used in compliance with those rules, while the European Union no longer authorizes titanium dioxide (E171) as a food additive. Brands selling across markets should select shell colors and opacifiers against the rules of every intended destination.
Conservateurs et adjuvants technologiques
Do not assume that every gelatin shell contains preservatives or that every plant-based shell is preservative-free. Modern empty hard capsules are supplied to defined microbiological and moisture specifications, and formulas differ. Ask for a complete ingredient statement, specification, allergen statement, and certificate of analysis for the exact shell grade and color.
Are Supplement Capsules Made of Plastic?
No. Edible pill and gélules de complément are not made from ordinary packaging plastic. Gelatin is a protein, while HPMC, pullulan, and other plant-based systems are edible film-forming polymers or polysaccharides designed to disintegrate or dissolve under specified conditions. “Polymer” is a chemistry term and does not mean that the shell is conventional plastic.
However, specialized delayed-release or pharmaceutical capsule systems can use modified polymers or coatings with controlled-release functions. Consumers should follow the product instructions, and brands should use the correct common or usual ingredient names and validated dissolution specifications.
How to Read “Other Ingredients” on the Label
In the United States, ingredients not declared in the Supplement Facts panel are generally listed in an ingredient statement headed “Other Ingredients.” The shell material, colors, flavors, fillers, binders, flow agents, and other excipients may appear there. Ingredients are generally listed in descending order of predominance by weight.
| Terme de l'étiquette | Ce que cela signifie généralement | Ce qu'il faut vérifier |
|---|---|---|
| Gélatine | Animal-derived capsule shell or softgel shell component | Bovine, porcine, fish, or mixed source; halal/kosher status |
| Hypromellose or HPMC | Cellulose-derived hard capsule shell | Full shell composition, gelling system, vegan and other certificates |
| Pullulan | Fermentation-derived polysaccharide shell | Source materials, certification scope, supplier barrier data |
| Glycerin or sorbitol | Common softgel plasticizer | Source, grade, formula compatibility, dietary claims |
| Color added or named colors | Colorant used in shell or product | Target-market permission, source, allergen or dietary implications |
| Titanium dioxide | White colorant or opacifier in markets where permitted | Destination-market compliance and customer requirements |
Which Capsule Material Is Best for Consumers?
There is no single best capsule material for everyone. Use the label and your dietary needs to narrow the choice:
- Choose a verified non-animal shell if you follow a vegan or vegetarian diet.
- Look for valid halal or kosher certification rather than relying only on “vegetable” or “bovine” wording.
- Check the full Other Ingredients list if you avoid particular colors, sweeteners, carrageenan, or other excipients.
- Do not open delayed-release, enteric, extended-release, or specialized capsules unless the manufacturer or a qualified healthcare professional confirms that it is appropriate.
- Ask a healthcare professional about the complete supplement formula if you are pregnant, nursing, taking medication, managing a medical condition, or have a known allergy.
Which Capsule Shell Should Supplement Brands Choose?
For brands and formulators, shell selection should be made after evaluating the fill—not from a marketing claim alone.
| Decision factor | Questions to answer before selection |
|---|---|
| Positionnement alimentaire | Does the product require vegan, vegetarian, halal, kosher, non-GMO, allergen, or organic certification? |
| Fill compatibility | Is the fill hygroscopic, oxygen-sensitive, acidic, alkaline, oily, reactive, or prone to cross-linking? |
| Release profile | Is immediate release acceptable, or is a validated delayed-release system required? |
| Portion | What fill weight and tapped density are required, and how many capsules per serving will consumers accept? |
| Target markets | Are every shell ingredient, color, and claim permitted in the United States, European Union, United Kingdom, Canada, Australia, and other intended markets? |
| Stabilité | How will heat, humidity, oxygen, light, and packaging affect the shell and fill over shelf life? |
| Fabrication | Does the shell run reliably on the selected equipment, and are weight variation, locking, polishing, inspection, and metal detection controls defined? |
| Commercial terms | What are the minimum order quantity, lead time, color matching process, tooling needs, and supply continuity plan? |
Before requesting a quote, estimate the required shell size from formula density and target fill weight using a capsule size chart and dimensions guide.
Capsule Shell Supplier and COA Checklist
- Complete shell composition and common or usual ingredient names
- Source and traceability information for gelatin, cellulose, starch, and plasticizers
- Certificate of analysis and current specification for the exact lot and shell grade
- Microbiological, heavy-metal, residual-solvent, moisture, and physical specifications as applicable
- Disintegration or dissolution method and acceptance criteria
- Allergen, GMO, BSE/TSE, vegan/vegetarian, halal, kosher, and organic documents as applicable
- Color-additive and target-market regulatory statements
- Storage conditions, shelf life, packaging configuration, and change-control commitments
- Compatibility, pilot-run, accelerated-stability, and real-time-stability data for the finished formula
GENSEI supports shell selection, formula review, capsule sizing, pilot and production planning, testing, packaging, and label coordination. Explore our fabrication de compléments en gélules capabilities to discuss a custom capsule project.
Questions fréquemment posées
What are pill capsules made of?
Most hard pill capsule shells are made from gelatin or HPMC. Gelatin is animal-derived, while HPMC is a cellulose-derived, non-animal material. Selected plant-based capsules use pullulan, starch, or other polysaccharide systems. Softgels usually contain gelatin or a specialized non-animal shell system, water, and a plasticizer.
What are vitamin capsules made of?
The shell is commonly gelatin or HPMC, while the fill contains the vitamins and any excipients needed for manufacturing or stability. Both the Supplement Facts panel and Other Ingredients list should be reviewed.
What are vegetarian capsules made of?
Many vegetarian hard capsules are made from HPMC, also called hypromellose. Others use pullulan or supplier-specific starch and polysaccharide systems. Verify the complete shell composition and any vegan, halal, kosher, or non-GMO documentation.
Les gélules sont-elles fabriquées à partir de porc ?
Some are, but not all. Gelatin capsules may use porcine, bovine, fish, or other approved gelatin sources. The animal source should be confirmed from the label, manufacturer, or supplier documentation.
Les capsules des compléments alimentaires sont-elles en plastique ?
No. Standard edible capsules are made from film-forming materials such as gelatin, HPMC, or pullulan. These are not ordinary packaging plastics and are designed to disintegrate or dissolve under specified conditions.
Can you open a supplement capsule?
Some immediate-release powder capsules can be opened, but delayed-release, enteric, extended-release, beadlet, probiotic, enzyme, and moisture-sensitive products may not be suitable for opening. Follow the label and ask the manufacturer or a qualified healthcare professional when uncertain.
Is HPMC always better than gelatin?
No. HPMC can support non-animal positioning and may be useful for some moisture-sensitive fills, while gelatin may offer cost and processing advantages. The better choice depends on fill compatibility, release requirements, certification, target markets, packaging, stability, and cost.
Références
- FDA : Questions et réponses sur les compléments alimentaires
- FDA: Dietary Supplement Labeling Guide, Chapter V—Ingredient Labeling
- FDA : Guide de conformité aux bonnes pratiques de fabrication en vigueur pour les compléments alimentaires
- FTC : Lignes directrices relatives à la conformité des produits de santé
- USDA AMS: National Organic Program Amendment Adding Pullulan
- U.S. eCFR: Titanium Dioxide Color Additive Regulation
- European Commission Regulation (EU) 2022/63 on Titanium Dioxide (E171)
- Comparative Evaluation of Gelatin and HPMC Capsule Shells Under Humidity Conditions
Editorial note: This article provides general educational and formulation information. Finished-product suitability, claims, labeling, certification, and regulatory compliance must be assessed for the exact formula, supplier documentation, manufacturing process, and target market.
Warren Wan est un expert chevronné qui possède une vaste expérience dans la chaîne d’approvisionnement des compléments alimentaires, ainsi qu’une solide expertise pratique dans la recherche, le développement, le contrôle des processus et l’approvisionnement mondial d’ingrédients clés tels que les peptides de collagène, les protéines de bouillon d’os et la kératine. En tant qu'auteur de cette chronique, il s'attache à aller au-delà des discours marketing pour transformer les notions scientifiques obscures relatives aux ingrédients et les normes de contrôle qualité de la production en une vulgarisation scientifique rigoureuse et accessible, aidant ainsi les lecteurs à comprendre la vérité qui se cache derrière les étiquettes et à faire des choix plus rationnels en matière de santé.
