HPMC Vegan Capsules: A Buyer’s Guide for Supplement Brands

HPMC (hypromellose) capsules are plant-based two-piece hard capsules used for vegan, vegetarian and clean-label supplements, and for formulas that are sensitive to moisture. This buyer’s guide from Capsules Hub Inc., a US supplier of bulk empty capsules based in Islandia, NY, covers what HPMC capsules are, when a brand should use them, and what to check before you place a bulk order.

If you are still deciding between materials, start with our side-by-side guide, gelatin vs HPMC capsules: how manufacturers choose. This article focuses on the practical buying decisions once HPMC is on the table.

What are HPMC capsules made of?

HPMC capsules are made from hydroxypropyl methylcellulose (hypromellose), a cellulose derivative from plant sources. The shell contains no animal-derived material.

They are standard two-piece hard capsules: a body and a cap that lock together after filling. That means they are designed to run on the same types of automatic and semi-automatic encapsulators as gelatin capsules, although settings may need adjustment.

When should a supplement brand choose HPMC capsules?

Choose HPMC when your label makes a vegan or vegetarian claim, when your fill is hygroscopic or moisture-sensitive, or when your customers expect a plant-based product. Otherwise gelatin is often the lower-cost choice.

• Vegan and vegetarian lines. A gelatin shell rules out a vegan claim; an HPMC shell supports it.
• Clean-label positioning. Plant-based shells align with products marketed on simple, plant-derived ingredients.
• Moisture-sensitive actives. Some probiotics, enzymes, effervescent blends and plant extracts can be affected by water migrating from a higher-moisture shell.
• Low-humidity environments. HPMC generally stays more flexible at lower humidity, where gelatin can become brittle.

How does HPMC compare with gelatin for brands?

The main trade-off is label positioning and moisture behaviour versus unit cost. The table summarises the points most relevant to a brand owner.

Brand consideration	HPMC capsules	Gelatin capsules
Vegan / vegetarian claim	Supported	Not supported
Halal positioning	Compatible (plant-based)	Requires certified gelatin; Capsules Hub gelatin is Halal certified
Typical shell moisture	About 3–7%	About 13–16%
Sizes at Capsules Hub	000–4	000–4
Typical unit cost	Usually higher	Usually lower

If an animal-derived shell is acceptable and your fill is a stable powder, Halal-certified gelatin capsules are often the most economical option.

What should I check before buying HPMC capsules in bulk?

Confirm the size, the shell specification, the documents your QA team needs and how the capsules perform on your own machine. A short pilot run is the most reliable check.

• Size. Work out the volume your dose needs and pick the smallest size that fits. Use the capsule size chart for volumes and approximate fill weights.
• Specification and documents. Ask for the specification sheet and list the documents you need for supplier qualification, such as a certificate of analysis and any statements your label requires. Capsules Hub provides disintegration specifications on request.
• Machine trial. Run a pilot batch on your encapsulator to confirm separation, filling and closing.
• Stability. For moisture-sensitive or reactive fills, run a short stability study before committing to a full production run.
• Storage. Keep cartons sealed in a controlled environment; see storing and handling empty capsules in bulk.

Can HPMC capsules be coloured, printed or enteric coated?

Yes. Capsules Hub offers custom colours and printing on HPMC, and enteric coated capsules on an HPMC base for plant-based delayed release.

Custom colour options include Pantone matching, two-tone cap and body, opaque or transparent shells, pearl finishes and single- or two-colour radial printing. Colour-matched samples are provided for approval before production. For acid-sensitive actives, enteric coated capsules are available on an HPMC base in sizes 00 to 3.

Is switching from gelatin to HPMC difficult?

It is usually manageable, but it should be treated as a formal change. The shell behaves differently, so check fill, closing and stability before you switch production.

Start with a pilot batch in the same size, compare fill-weight consistency and rejects, and review machine settings. Update your label claims and supplier qualification file once the change is approved. Capsules Hub can advise on fill compatibility and encapsulation parameters during the transition.

Frequently asked questions

Are HPMC capsules vegan?

HPMC capsules are made from hydroxypropyl methylcellulose, a plant-derived cellulose, with no animal products in the shell. Capsules Hub HPMC capsules are described as vegan and vegetarian suitable. Check the documentation for any colourants or printing inks used.

Do HPMC capsules cost more than gelatin?

Usually, yes. HPMC capsules generally have a higher unit cost than gelatin. Request a bulk quote for pricing at your volumes.

Can I switch an existing product from gelatin to HPMC?

Often, but treat it as a change. Run a pilot on your encapsulator, check fill weight and closing, and run stability and disintegration checks before switching production.

What sizes do HPMC capsules come in?

Capsules Hub supplies HPMC capsules in all standard sizes: 000, 00, 0, 1, 2, 3 and 4. Enteric coated HPMC-base capsules are available in sizes 00 to 3.

How do I request a bulk quote?

Send your capsule type, size, colour, approximate quantity, delivery location, timeline and the documents your QA team needs through the Capsules Hub bulk quote form. Specify HPMC as the material, plus the size and colour, and we will reply with bulk pricing and availability for your volumes.

Capsules Hub Inc. is a US-based supplier of empty two-piece hard capsules, located at 85 Hoffman Lane, Unit W, Islandia, NY 11749. Call 631-819-0355 or email sales@capsuleshub.us. We supply bulk cartons to manufacturers only; we do not sell retail packs.