Overview
Gelatin capsules are a versatile encapsulation solution derived from animal collagen, primarily used in the pharmaceutical and supplement industries. They consist of two parts (body and cap) that fit together to form a sealed container for powders, liquids, or semi-solid formulations. Their popularity stems from their ease of use, rapid dissolution in the stomach, and ability to mask unpleasant tastes or odors. Available in various sizes (ranging from 000 to 5), gelatin capsules can be customized with colors, printing, or coatings for branding or functional purposes. They are particularly favored for oil-based supplements like fish oil or vitamin E due to their compatibility with lipid formulations.
Physical and Chemical Properties
Gelatin capsules exhibit unique thermo-reversible gelling properties, softening at body temperature for easy digestion. Their moisture content (typically 13-16%) is critical for maintaining flexibility; deviations can cause brittleness or sticking. The capsules dissolve rapidly in gastric fluids due to gelatin's hydrophilic nature, ensuring quick release of encapsulated contents. Chemically, gelatin is a mixture of peptides and proteins produced by partial hydrolysis of collagen. The bloom strength (a measure of gel rigidity) typically ranges between 150-250 for capsule-grade gelatin. Additives like glycerin (as a plasticizer) or titanium dioxide (for opacity) may be included to modify physical characteristics without compromising safety.
Main Applications
In pharmaceuticals, gelatin capsules are the preferred delivery system for solid-dose medications, especially those requiring precise dosing or protection from oxidation. They account for approximately 30% of oral drug formulations globally. Common examples include antibiotics, probiotics, and over-the-counter pain relievers. The nutraceutical industry extensively uses gelatin capsules for dietary supplements such as multivitamins, herbal extracts, and omega-3 fatty acids. Their ability to encapsulate oils makes them ideal for fat-soluble nutrients. Emerging applications include cannabis oil capsules and personalized supplement blends, where capsules offer dosing accuracy and consumer convenience.
Safety and Storage
Proper storage is essential to maintain capsule integrity. Exposure to temperatures above 40°C can cause deformation, while humidity below 35% RH may lead to brittleness. Industrial users should store bulk capsules in sealed containers with desiccants and avoid temperature fluctuations during transportation. While gelatin capsules are generally recognized as safe (GRAS), some religious or dietary restrictions (e.g., halal, kosher, vegetarian) require alternative materials like hypromellose (HPMC). Allergen labeling is mandatory in many jurisdictions, as gelatin may derive from bovine or porcine sources. Manufacturers must comply with GMP standards to prevent cross-contamination with allergens or pathogens.
B2B Procurement Guide
When sourcing gelatin capsules, buyers should verify the supplier's certification (e.g., ISO 9001, cGMP) and request certificates of analysis for critical parameters like dissolution rate and heavy metal content. For international shipments, consider climate-controlled logistics to prevent capsule damage. Minimum order quantities (MOQs) typically start at 100,000 units for standard sizes, with lead times of 2-6 weeks depending on customization requirements. Some suppliers offer empty capsule filling machines as part of bundled solutions. Price breaks are usually available at order volumes exceeding 1 million units, with additional discounts for long-term contracts.
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