Download Your Copy of the FAQ Guide Improve your understanding of dietary supplements and the claims that can violate policies. LegitScript experts provide answers to the most common questions e-commerce marketplaces have about dietary supplements. This 20-page Dietary Supplements FAQ guide provides helpful resources and in-depth answers to questions, including: What claims are supplements permitted to make? What are disease claims and structure/function claims? What is adequate substantiation? Are there ingredients that are not permitted in dietary supplements? Is there such a thing as "legal steroids"?