Many people assume that a larger number means a larger capsule. In reality, capsule sizes follow a reverse numbering system: the smaller the number, the larger the capsule.
So, size 00 capsules are larger than size 0 capsules. Size 00 capsules are longer and have a greater internal volume, allowing them to hold more powder.
As demand for smaller capsules increased, manufacturers introduced new capsule molds after the original larger sizes were already established. Instead of renaming existing sizes, they simply added numbers to indicate smaller dimensions. Once capsule sizes became regulated and standardized worldwide, this numbering system was retained to avoid confusion—and it remains in use today.
Capsule Size 0 vs Size 00: Dimensions, Volume, and Capacity
Size 00 capsules offer significantly more internal volume than size 0 capsules, making them suitable for higher-dose formulations.
Key Takeaways: Size 0 vs Size 00
- Size 00 has approximately 40% more internal volume than size 0
- Size 0 is generally easier to swallow
- Size 00 helps reduce the number of capsules per serving for high-dose formulas
- Both sizes are industry standards and widely used in supplement manufacturing
Size 0 vs Size 00: Which Should You Choose?
The right choice depends on dosage requirements and user comfort, not just capsule size.
When Size 0 Is the Better Choice
- Moderate-dose supplements
- Daily-use products
- Consumers who prefer easier swallowing
- Single-ingredient formulations
Size 0 capsules are often considered a good balance between capacity and swallowability.
When Size 00 Is the Better Option
- High-dose supplements
- Multi-ingredient formulations
- Herbal powders or protein-based powders
- Products designed to minimize capsules per serving
Using size 00 capsules can significantly reduce the number of capsules a user needs to take each day.
Swallowability
While both capsule sizes are widely used, size 0 capsules are generally easier to swallow. Size 00 capsules may feel large, especially for consumers who are not accustomed to taking capsules.
This is why some brands choose size 0 capsules—even if it means taking two capsules per serving instead of one size 00 capsule.
Capsule Size and Capsule Filling Machines
From a production perspective:
- Both size 0 and size 00 are standard industry sizes
- Most capsule filling machines support both sizes
- Changing capsule size usually requires only a mold or tooling adjustment
This makes size 0 and size 00 capsules practical options for both small-scale and large-scale production.
In addition to size 0 and 00, many other capsule sizes are available, allowing manufacturers to select the most suitable option for their specific formulation.
If you plan to fill capsules or manufacture dietary supplements, choosing the right capsule size is only part of the process. Filling accuracy, efficiency, and consistency depend heavily on using the right equipment.
Contact us today to learn more about capsule filling machines compatible with size 0, size 00, and other standard capsule sizes. We can help you select a solution that best matches your production requirements and formulation goals.
