Empty gelatin capsules are widely used in supplement and nutraceutical projects, but buyers should not choose them by price and size alone. A good procurement decision checks hard capsule format, fill weight, powder behavior, packaging, quality documents, and sample filling before bulk approval.
1. Confirm the format: hard gelatin capsules, not softgels
This guide focuses on empty hard gelatin capsules, the two-piece capsule shells used for powder, granule, pellet, or blend filling. Soft gelatin capsules are a different dosage form with a different manufacturing process, so buyers should not treat hard capsule sourcing and softgel sourcing as the same task.
2. Start with formula behavior and target fill weight
Gelatin capsule size selection depends on the target fill weight and how the formula behaves. A fluffy herbal powder may need a larger capsule than a dense granule at the same target weight. Use the capsule size chart for early planning, then confirm with sample filling.
| Buyer check | Why it matters | What to prepare |
|---|---|---|
| Target fill weight | Determines the first size range to test | Expected mg per capsule and acceptable size range |
| Powder density and flow | Changes real fill weight and machine behavior | Formula type, powder/granule notes, trial blend if available |
| Capsule material | Gelatin, HPMC, and pullulan solve different sourcing needs | Material preference and target market requirements |
| Packaging plan | Storage humidity and transport conditions affect the project | Bottle, blister, pouch, bulk packaging, or other format |
3. When gelatin capsules are a practical choice
Hard gelatin capsules are often reviewed for conventional supplement products when the buyer wants a familiar two-piece hard capsule format, mature filling behavior, and common size options. They are also useful when the project does not require plant-origin positioning.
If the project needs plant-based positioning or a lower-moisture shell discussion, compare HPMC capsules vs gelatin capsules before approving the sample range.
4. Size, color, and printing requirements
Common empty gelatin capsule sizes include 00, 0, 1, 2, 3, and 4. Buyers should also confirm color, transparency, and printing needs before sampling. If printing is required, the artwork, ink color, sample approval, and batch consistency should be discussed before bulk production.
5. Quality documents to request
Before approving a gelatin capsule supplier, request applicable documents such as specification sheet, COA, batch traceability record, packaging details, color or printing notes, and target-market documentation. The StellarCaps document center explains common files buyers may review.
6. Sample testing before bulk purchase
- Test the planned capsule size and one adjacent size if the formula is near the fill-weight limit
- Check feeding, orientation, locking quality, visible defects, and filled appearance
- Confirm whether the filled capsule works with the selected bottle, blister, pouch, or bulk packaging
- Record reject rate and machine notes before approving bulk orders
- Compare supplier documents and samples before making a final supplier decision
Frequently Asked Questions
Are empty gelatin capsules suitable for supplement manufacturing?
They are widely used in supplement projects, but suitability depends on formula behavior, storage, packaging, size, documents, and sample filling results.
What sizes are common for gelatin capsules?
Common sizes include 00, 0, 1, 2, 3, and 4. Fill weight is only a reference because powder density and filling setup change the actual result.
Should I choose gelatin or HPMC capsules?
Choose based on formula, moisture discussion, product positioning, target market, documents, cost, and sample testing. There is no universal answer.
What should I send in an RFQ?
Send target size, fill weight, formula type, material preference, color, printing needs, quantity, packaging, target market, and required documents.
Next step
If you are choosing empty gelatin capsules for supplement manufacturing, contact StellarCaps with your target size, fill weight, formula type, color or printing needs, quantity, packaging, and document requirements.