Because of all the different sizes, shapes and dimension variations with two-piece hard shell capsules, soft gels and tablets, it can be difficult to grasp why certain ones are best for your product. In many cases, the selection of the size and shape often comes down to how much of the powder or liquid is needed per dose. Therefore, we put together reference guides to help you understand what goes on in the selection process. Also, we hope you find our Recommended Daily Allowance (RDA) reference guide useful when marketing your vitamin and/or mineral product.