Quick answer for procurement teams
If you are preparing a bulk order for empty capsules, do not start only with price. First confirm the material, capsule size, filling compatibility, target market, documentation needs, and sample review process. This is especially important for empty gelatin capsules, HPMC capsules, vegetarian capsules, and custom color or printing projects where formulation fit and buyer documentation can affect the whole procurement timeline.
In international sourcing, some buyers may still search for hollow capsules, but the clearer buyer term is empty capsules. Use hollow capsules as a secondary synonym in FAQ or glossary copy, while keeping empty capsules, gelatin capsules, HPMC capsules, supplier, manufacturer, bulk, wholesale, and OEM terms in the main article context.
Who this guide is for
This guide is written for pharmaceutical, nutraceutical, and supplement buyers who need samples before confirming a wholesale or OEM order. It is also useful for sourcing teams comparing a capsule supplier, capsule manufacturer, or capsule shell partner for new product development. The goal is to help the buyer request the right sample set, review the sample in a structured way, and move from sample confirmation to RFQ without repeating the same questions.
What to decide before requesting samples
Before contacting a supplier, prepare five groups of information. First, decide the target material: gelatin, HPMC, pullulan, or another plant-based option. Second, choose likely sizes such as 00, 0, 1, 2, 3, or 4, or ask for a capsule size chart if the fill weight is still being calculated. Third, define whether the capsules need to be clear, colored, printed, delayed-release, acid resistant, or TiO2-free. Fourth, list the target market and documentation requests, such as specification sheet, COA, Halal, Kosher, BSE/TSE statement, or other declarations if applicable. Fifth, estimate the first bulk quantity range so the supplier can judge whether the request is a sample review, a pilot order, or a regular wholesale procurement project.
Sample request checklist
| Decision point | What the buyer should provide | Why it matters |
|---|---|---|
| Material | Gelatin, HPMC, pullulan, vegetarian, vegan, or undecided | Material affects moisture behavior, label positioning, dissolution profile, and dietary expectations. |
| Size | 00, 0, 1, 2, 3, 4, or target fill weight | Size controls fill volume, machine settings, and consumer experience. |
| Appearance | Clear, colored, printed, opaque, or TiO2-free preference | Appearance affects brand recognition and light protection requirements. |
| Documents | Specification sheet, COA, and market-specific declarations if needed | Documentation helps quality, regulatory, and purchasing teams review the supplier. |
| Commercial plan | Sample quantity, pilot quantity, expected bulk volume, destination market | The supplier can prepare a more accurate lead time, quotation, and sample plan. |
How to review empty capsule samples
When the samples arrive, evaluate them against the same criteria you will use for bulk purchasing. Check visual consistency, cap-body fit, brittleness, odor, printing clarity if any, and compatibility with the intended powder or granule. If you are comparing gelatin vs HPMC capsules, pay special attention to moisture sensitivity, vegetarian or vegan label requirements, storage conditions, and whether the target formulation needs a plant-based capsule shell. For capsule size selection, compare the sample with your fill weight calculation instead of relying only on the size name.
Useful internal resources before RFQ
Before sending a final RFQ, review the relevant product and service pages. Buyers comparing animal-derived and plant-based options can start with empty gelatin capsules and HPMC capsules. Teams still confirming fill weight can review capsule size options. If the project needs color matching or printing, review custom capsule colors and capsule printing. For documentation planning, check quality and certification information, then use the contact page to request samples, ask for a bulk quote, or get a specification sheet.
Common mistakes in sample requests
The first mistake is asking only for the cheapest capsule without explaining the application. A supplier cannot judge the right material or sample set without knowing the formulation type and market. The second mistake is treating size 00 and size 0 as interchangeable. Even small differences in capacity can affect fill weight and user experience. The third mistake is asking for documents after the sample has already been approved. It is better to list required documents at the beginning so the sample review and quality review run in parallel. The fourth mistake is using one sample to decide a complex OEM project. For custom color, printing, or special packaging, the sample plan should include both physical samples and a written confirmation of next-step production requirements.
FAQ
Are empty capsules and hollow capsules the same thing?
They are often used to describe similar capsule shells, but empty capsules is the stronger buyer term in English SEO. Hollow capsules can appear as a secondary synonym, especially in supplier or glossary contexts.
Should buyers request gelatin or HPMC capsule samples first?
If the product has no vegetarian, vegan, or moisture-sensitive requirement, gelatin samples are often a practical starting point. If the product needs plant-based positioning, lower moisture, or a vegetarian capsule shell, HPMC samples should also be reviewed.
What should be included in a sample request email?
Include material, size, color, estimated bulk quantity, destination market, application, required documents, and whether you need printing or custom packaging.
Next step
Use this article as a sample request checklist. If your team is ready to compare options, request samples, ask for a bulk quote, or get a specification sheet through StellarCaps contact. A clear sample request helps both the buyer and the supplier move faster from technical review to quotation.