What is the moisture content in a soft gelatin capsule?

• A. 4-6%
• B. 6-10%
• C. 10-14%
• D. 14-18%

Answer: (B)

Moisture in soft gelatin capsules is kept as a plasticizer component to keep the shell flexible. The typical range is about 6–10% by weight. This balance allows the capsule to bend and seal properly during packaging and handling, while avoiding excessive softness that could lead to leakage or sticking.

If the moisture is too low, the shell becomes brittle and can crack under stress, risking capsule failure. If the moisture is too high, the shell becomes too soft or tacky, increasing the risk of deformation, leakage, or microbial growth. The water content works with plasticizers like glycerin or sorbitol to set the capsule’s properties at room temperature, helping ensure stability during storage.