Mark Bio Technology / Knowledge library / Double Capsule

What is a Double Capsule?
The capsule-in-capsule supplement format

Updated 6 November 2026 · Mark Bio R&D team

A Double Capsule, also called a Double Dual Capsule or capsule-in-capsule, is a supplement format with a small capsule sealed inside a larger one. This guide explains the structure, benefits, limits and how production works, for brand owners looking for a new selling point.

Double Capsule manufacturing at Mark Bio Technology

What is a Double Capsule?

A Double Capsule (Double Dual Capsule, capsule-in-capsule) is a supplement capsule with a smaller capsule inside a larger one, so two actives are kept in separate layers of one dose. It suits formulas whose ingredients should not touch before intake, and brands that want a distinctive format. Mark Bio Technology runs a Double Capsule machine at its factory in Thanyaburi, Pathum Thani, Thailand. Minimum order is 5,000 units; production takes about 30–60 days.

How is a Double Capsule built?

A Double Capsule has two layers:

Inner capsule: a small capsule holding the first active.
Outer capsule: a larger capsule that encloses the inner one and holds the second active in the space around it.

The result is one dose carrying two formulas that stay apart until it is taken. Many brands use a clear outer shell so the inner capsule is visible, which makes the product stand out on the shelf and in online content.

Why supplement brands choose Double Capsules

Keep incompatible ingredients apart. Some actives can react or degrade faster when mixed in the same fill. Separate layers reduce that risk (suitability is assessed for each formula by R&D).
Two formulas in one dose. Fewer pills per day for the customer, and a clear 2-in-1 product story.
A visible selling point. A capsule inside a capsule photographs and films well, helping a new brand stand apart from ordinary capsules.
Premium positioning. A harder-to-make format signals value and supports a higher price point.

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Double Capsule compared with other capsule formats

Format	Structure	Fill	Strength
Hard capsule	Two-piece shell	Powder or pellets	Cost-effective, fits most formulas
Double Capsule	Small capsule inside a larger one	Two actives in separate layers	Keeps actives apart, eye-catching
Liquid Capsule	Hard capsule with a sealed joint	Liquids such as oils or liquid extracts	Uses liquid extracts directly
Softgel	One-piece soft shell	Oils or liquids	Easy to swallow, familiar to buyers

What to know before producing a Double Capsule

Less fill space than a single capsule. The inner capsule takes up room, so the amount of each active per dose is planned during formulation.
Choose the right size. Mark Bio uses size 00, 0 and 1 capsules depending on fill weight, recommended in your spec sheet.
Higher cost per dose. Extra material and steps cost more than a single-layer capsule, so plan price point and target customers early.
Thai FDA registration. A Double Capsule is a food supplement and needs a 13-digit food serial number, with labelling as the Thai FDA requires. Our team prepares and files it.
Samples before production. R&D makes samples so you can check the look and formula before approving production.

How Double Capsule production works at Mark Bio

Free consultation on your brand brief, customers and budget.
R&D designs the inner and outer formulas and picks the capsule size.
Samples for you to test and refine until approved.
Documents prepared and filed for Thai FDA registration.
Label and packaging design.
Production on our on-site Double Capsule machine under ISO 22000:2018, HACCP, GHP and HALAL.
Quality checks on every lot, traceable to raw materials.
Delivery.

Minimum order starts at 5,000 units per formula; production takes about 30–60 days depending on format and packaging.

Double Capsule FAQ

Is a Double Capsule the same as a Double Dual Capsule?

Yes. Both names describe the same capsule-in-capsule format.

Which formulas suit a Double Capsule?

Formulas with two groups of actives that should not mix before intake, or brands wanting a distinctive 2-in-1 product. R&D assesses each formula before sampling.

Does a Double Capsule cost more than a regular capsule?

Yes, because it uses two capsules and extra production steps. Actual cost depends on formula, capsule size and packaging, as set out in your quotation.

Which factory in Thailand makes Double Capsules?

Mark Bio Technology runs a Double Capsule machine at its factory in Thanyaburi, Pathum Thani, under ISO 22000:2018, HACCP, GHP and HALAL. Minimum order is 5,000 units.

How long does Double Capsule production take?

About 30–60 days depending on format and packaging; you get a step-by-step timeline when work starts.

Can I start a Double Capsule without a formula?

Yes. With ODM, R&D develops both layers and makes samples until you are happy.

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