Size 00 Capsule: Dimensions, Volume, MG Capacity & Best Uses for Supplement Brands

A Taille 00 capsule, also called a double zero capsule, is one of the most common high-capacity capsule sizes used for dietary supplements. It typically has an internal volume of about 0.90–0.95 ml, a locked length of about 23.4 mm, and a cap diameter of about 8.56 mm.

In real supplement manufacturing, a Size 00 capsule does not hold one fixed mg amount. It holds a fixed volume. The final mg capacity depends on the tapped density, flowability, particle size, moisture level, and excipient system of the finished blend.

As a practical planning range, Size 00 capsules often hold about 540–950 mg for many supplement powders. Dense materials may fit more, while fluffy herbal, mushroom, collagen, or fiber-based powders may fit less. For a complete comparison across all sizes, see our capsule sizes chart and dimensions guide.

Size 00 Capsule Quick Specifications

For most brands, the first question is simple: “How big is a Size 00 capsule, and how much can it hold?” The table below gives a practical planning view.

Spécifications	Size 00 Capsule
Common name	Double zero capsule
Approx. volume	0.90–0.95 ml
Approx. locked length	23.4 mm
Approx. cap diameter	8.56 mm
Common planning fill range	540–950 mg, depending on powder density
Compared with Size 0	Larger, higher capacity, usually less easy to swallow
Compared with Size 000	Smaller, lower capacity, usually more user-friendly
Best suited for	Medium-to-high dose supplement formulas where Size 0 is too small

Different suppliers may publish slightly different Size 00 values. Some charts use 0.90 ml, while others use 0,95 ml. This difference is normal and may reflect supplier specifications, shell design, measurement method, capsule material, or whether the chart is using nominal capacity. For commercial production, always confirm the final capsule size with your actual blend and production equipment.

What Is a Size 00 Capsule Used For?

Size 00 is commonly used when a formula needs more space than Size 0 can provide, but the brand does not want to move to the larger Size 000 capsule. This makes it a popular choice for supplement products where a balance between capacity and swallowability matters.

For example, many magnesium blends, herbal formulas, mushroom supplements, and sports nutrition capsules may need the extra volume of Size 00. However, Size 00 is not automatically the best choice for every product. A smaller capsule may be better if the formula fits, and a powder or stick-pack format may be better if the serving size is too large for capsules.

If you are choosing a capsule format for a commercial product, capsule size should be decided together with formula design, serving size, bottle count, capsule material, and packaging. You can learn more about commercial capsule production on our fabrication de compléments en gélules page.

How Many MG Can a Size 00 Capsule Hold?

The most important point is this: Size 00 capsule capacity in mg depends on powder density. A capsule has a volume limit, but powders do not all weigh the same at the same volume.

A dense mineral powder may fit much more weight into Size 00 than a fluffy botanical powder. A mushroom blend with carriers, a collagen blend, or a high-fiber formula may occupy more space even when the label claim looks lower in mg.

Powder Tapped Density	Estimated Fill Weight in Size 00	What This Usually Means
0.5 g/ml	~450–475 mg	Very bulky powder; Size 00 may hold less than expected.
0.6 g/ml	~540–570 mg	Common estimate for bulky herbal or botanical blends.
0.7 g/ml	~630–665 mg	Moderate-density blend; Size 00 may work for many formulas.
0,8 g/ml	~720–760 mg	A common planning estimate for medium-density powders.
0.9 g/ml	~810–855 mg	Higher-density blend; Size 00 can hold more weight.
1.0 g/ml	~900–950 mg	Dense powder; Size 00 may approach the upper planning range.
1.2 g/ml	~1,080–1,140 mg	Very dense material; possible in theory, but production testing is required.

These values are planning estimates, not guaranteed production fill weights. The finished blend must still be tested for flow, settling behavior, fill weight consistency, and capsule compatibility.

Why Size 00 Capacity Numbers Differ Across the Internet

If you compare capsule charts, you may see Size 00 described as holding 570 mg, 735 mg, 750 mg, 900 mg, 950 mg, or even more. This does not always mean one source is wrong. It usually means the source is using a different powder density assumption.

For example, a Size 00 capsule with about 0.90 ml volume may hold around 540 mg at 0.6 g/ml density, 720 mg at 0.8 g/ml density, and 900 mg at 1.0 g/ml density. If another chart uses 0.95 ml as the planning volume, the numbers become slightly higher.

This is why supplement brands should avoid asking only, “How many mg does a Size 00 capsule hold?” The better question is:

What is the required volume of my finished formula after density, excipients, flow agents, and manufacturing overage are included?

How to Calculate Whether Your Formula Fits Size 00

To estimate whether your formula fits Size 00, use capsule volume and tapped density instead of relying on a single generic mg value.

Calculation Goal	Formule	Exemple
Estimate fill weight	Capsule volume × tapped density × 1000	0.90 ml × 0.8 g/ml × 1000 = 720 mg
Estimate required volume	Formula weight ÷ 1000 ÷ tapped density	700 mg ÷ 1000 ÷ 0.8 g/ml = 0.875 ml

If your formula target is 700 mg and the tapped density is 0.8 g/ml, the required capsule volume is about 0.875 ml. Since Size 00 is typically around 0.90–0.95 ml, the formula may fit. However, if the powder flows poorly, clumps, or requires additional excipients, the same formula may become too bulky in practice.

For this reason, final capsule size should always be confirmed with trial filling, not only spreadsheet calculations.

Can 500 mg Fit in a Size 00 Capsule?

Yes, 500 mg can often fit into a Size 00 capsule. But in many cases, 500 mg may also fit into a smaller capsule if the powder is dense enough.

The real issue is not the 500 mg number. The real issue is powder density. A dense 500 mg mineral blend may fit easily into Size 0, while a fluffy 500 mg mushroom or herbal blend may need Size 00.

500 mg Formula Density	Volume requis	Size 00 Decision
1.0 g/ml	0,50 ml	Size 00 fits, but may be larger than necessary.
0,8 g/ml	0.625 ml	Size 00 fits; Size 0 may also be possible.
0.6 g/ml	0.833 ml	Size 00 is often a practical choice.
0.5 g/ml	1.00 ml	May be tight for Size 00; testing is required.

For a commercial supplement brand, the decision should include both formula fit and user experience. If Size 0 works, it may create a more consumer-friendly capsule. If Size 0 does not work, Size 00 can reduce the number of capsules per serving.

Can 750 mg Fit in a Size 00 Capsule?

A 750 mg formula can fit into Size 00 if the blend has medium-to-high tapped density and good flowability. It may not fit if the powder is bulky or low-density.

750 mg Formula Density	Volume requis	Size 00 Decision
1.0 g/ml	0.75 ml	Likely fits Size 00.
0,8 g/ml	0.94 ml	May fit, but it is close to the limit.
0.7 g/ml	1.07 ml	Usually too bulky for Size 00.
0.6 g/ml	1.25 ml	Usually requires Size 000, multiple capsules, or reformulation.

This is why Size 00 is often associated with 700–750 mg supplement formulas, but the association should not be treated as a rule. Two 750 mg formulas can behave very differently during capsule filling.

Size 00 vs Size 0 vs Size 000: Which Should You Choose?

Size 00 sits between Size 0 and Size 000. It offers more capacity than Size 0, but it is usually easier to use than Size 000 for many consumers.

Taille de la capsule	Approx. Volume	Meilleur pour	Main Trade-Off
Taille 0	~0.68 ml	Lower-dose formulas and easier-swallow daily products	Less fill capacity
Taille 00	~0.90–0.95 ml	Medium-to-high dose formulas where Size 0 is too small	Larger than Size 0
Taille 000	~1.27–1.37 ml	Very high-volume formulas where reducing capsule count is the priority	May be difficult for some users to swallow

Choisir Size 00 instead of Size 0 when your formula does not fit comfortably into Size 0 or when you need to reduce capsules per serving. Choose Size 0 instead of Size 00 when the formula fits and swallowability is more important than maximizing fill weight.

Choisir Size 000 instead of Size 00 only when the formula truly needs the additional volume and your target market is likely to accept a larger capsule. For many daily wellness products, two Size 00 capsules may be more acceptable than one very large Size 000 capsule.

Best Uses for Size 00 Capsules in Supplement Products

Size 00 is most useful when it solves a real formulation problem: the brand needs more capacity than Size 0, but still wants a capsule format that can be used in a daily supplement routine.

Type de produit	Size 00 Suitability	Raison
Magnesium and mineral blends	Often suitable	Medium-to-high dose formulas may need more capsule volume.
Herbal and botanical blends	Often suitable	Many botanical powders are bulky and may need Size 00 even at moderate mg levels.
Mushroom supplements	Often suitable	Extract powders and carriers can vary in density, so Size 00 is commonly considered.
Sports nutrition capsules	Sometimes suitable	Users may accept a larger capsule if it reduces the total capsule count.
Multivitamines	Sometimes suitable	Depends on the total active load, mineral content, and excipient needs.
Probiotiques	Case-by-case	Stability, moisture, oxygen exposure, and packaging may matter more than size.
Collagen peptide products	Often not ideal as a standalone format	Typical collagen servings are often too large for a convenient capsule serving.

For collagen peptide products, Size 00 capsules may work for lower-dose beauty-from-within blends, but powder, sachet, or stick-pack formats are often more practical for gram-level collagen servings. If you are developing a custom format, review our fabrication de compléments alimentaires sur mesure capabilities.

When Size 00 May Not Be the Best Choice

Because Size 00 is popular, brands sometimes choose it too quickly. But a larger capsule is not always better.

Size 00 may not be ideal when your formula already fits comfortably into Size 0. In that case, using Size 00 may make the product feel unnecessarily large and reduce user comfort. It may also be a poor fit if your audience is sensitive to capsule size, such as first-time supplement users or consumers looking for an easy-swallow daily product.

Size 00 may also be the wrong format if the total serving still requires too many capsules. If a formula needs four, five, or six Size 00 capsules per serving, the issue may not be capsule size. The issue may be dosage form. A powder, stick pack, tablet, gummy, or liquid may create a better product experience.

Finally, Size 00 may not solve poor powder behavior. If the blend is sticky, clumpy, hygroscopic, or difficult to flow, capsule filling may require formula adjustment, flow agents, granulation, or a different manufacturing approach.

Manufacturing Factors Before Choosing Size 00

For supplement brands, the correct capsule size should be confirmed during formulation and pilot production. A generic chart can help with early planning, but it cannot replace actual testing.

Tapped Density of the Finished Blend

Tapped density should be measured on the finished blend, not only on individual ingredients. Once actives, excipients, flow agents, flavors, colorants, and overages are combined, the blend may behave differently from the original ingredient estimates.

Powder Flowability and Fill Weight Consistency

Powder flow affects capsule filling speed and fill weight consistency. Poor-flowing powders can bridge, clump, or fill unevenly. This may create production issues even if the formula appears to fit by volume.

Capsule Shell Material

Size 00 capsules may be available in gelatin, HPMC, pullulan, or other shell systems depending on the supplier. Shell material can affect vegan or vegetarian positioning, moisture sensitivity, cost, compatibility, and brand claims.

Serving Size and Bottle Count

A larger capsule can reduce capsules per serving, but it can also affect bottle size, packaging cost, shipping weight, and user perception. Capsule size, serving count, and bottle count should be planned together.

Consumer Compliance

The goal is not just to fit the formula into a capsule. The goal is to create a product that users can take consistently. A smaller capsule count may improve compliance, but only if the capsule size remains acceptable for the target audience.

Size 00 Capsule Decision Framework for Brands

Use this decision framework before finalizing Size 00 for a supplement product.

Decision Question	Ce qu'il faut vérifier
Does the formula fit by volume?	Calculate required volume from formula weight and tapped density.
Does the formula fill consistently?	Run trial filling and check fill weight variation.
Is the serving count acceptable?	Check how many capsules the user must take per serving and per day.
Is the capsule comfortable for the target user?	Consider the user group, product positioning, and swallowability expectations.
Does the shell material fit the formula?	Review gelatin, HPMC, vegan claims, moisture sensitivity, and compatibility.
Does packaging still make sense?	Confirm bottle count, bottle size, label space, shipping weight, and cost.

If the answer is unclear at any step, do not finalize capsule size based only on a chart. Work with your manufacturer to test the blend and compare practical options.

Practical Examples

Example 1: 750 mg Mineral Formula

A 750 mg mineral formula with medium-to-high density may fit into Size 00. If Size 0 is too small and Size 000 is not necessary, Size 00 may be the most practical choice.

Example 2: 650 mg Herbal Blend

A 650 mg herbal blend may sound suitable for Size 00, but many herbal powders are low-density. The formula may require trial filling before the brand can confirm Size 00.

Example 3: 500 mg Mushroom Supplement

A 500 mg mushroom formula may fit into Size 0 if the extract is dense, or Size 00 if the powder is bulkier or includes carriers. The correct answer depends on the finished blend, not the ingredient name alone.

Example 4: 2,000 mg Collagen Peptide Serving

A 2,000 mg collagen serving would likely require multiple Size 00 capsules. For this type of product, a powder, sachet, or stick-pack format may create a better consumer experience than capsules.

What to Send Your Manufacturer Before Choosing Size 00

To get a reliable capsule size recommendation, provide your manufacturer with more than a target mg amount.

Information to Provide	Pourquoi c'est important
Full formula or target active list	Helps estimate total fill weight and excipient needs.
Target serving size	Determines capsule count per serving.
Ingredient densities, if available	Improves early capsule size estimates.
Preferred capsule material	Supports gelatin, vegetarian, vegan, or other brand requirements.
Target user group	Helps balance capacity and swallowability.
Packaging target	Connects capsule size with bottle count, label design, and shipping cost.

At Collagensei, we help supplement brands evaluate capsule size, formula feasibility, capsule materials, fill weight, and packaging before production. This reduces the risk of choosing a capsule size that looks correct in theory but fails during real manufacturing.

FAQ: Size 00 Capsules for Supplement Brands

Is Size 00 the most common capsule size for supplements?

Size 00 is one of the most commonly used capsule sizes in supplements because it offers a strong balance between fill capacity and consumer usability. However, Size 0 is also common when brands prioritize a smaller, easier-swallow capsule.

Does capsule shell material change Size 00 capacity?

The nominal size may be the same, but actual specifications can vary slightly by supplier and shell system. Gelatin, HPMC, pullulan, and other capsule materials may also differ in moisture behavior, cost, and brand claim suitability.

Can Size 00 capsules be used for liquid or oil fills?

Deux pièces standard capsules dures are usually used for dry powders. Liquid, oil, or semi-solid fills require compatible capsule systems and proper manufacturing controls. Brands should confirm compatibility with their manufacturer before choosing Size 00 for non-powder fills.

Should a brand choose Size 00 to reduce capsule count?

Size 00 can help reduce capsule count, but only if the capsule remains acceptable for the target user. A larger capsule with fewer pills is not always better than a smaller capsule with better swallowability.

When should a brand move from capsules to powder?

If the serving requires too many Size 00 capsules, powder may be a better format. This is common for gram-level servings such as collagen peptides, protein blends, fiber formulas, and some sports nutrition products.

Références

• Vivion Capsule Size Guide — referenced for capsule numbering, Size 00 specifications, and manufacturer-oriented capsule sizing considerations.
• LFA Capsule Size Chart — referenced for Size 00 capsule volume, overall length, and cap diameter.
• Capsuline Empty Capsule Size Chart — referenced for capsule size comparison and capacity by formulation density.
• Capsuline Size 00 Capsule Guide — referenced for Size 00 capsule volume, dimensions, and practical capacity range.
• Vitaquest Capsule Size Guide — referenced for supplement-brand capsule size selection, common capsule use cases, and Size 00 positioning in dietary supplement formulation.