The sale and variety of dietary supplements such as vitamins, minerals, herbal mixtures, and hormones have expanded tremendously in recent years, accounting for $6.5 billion in sales in 1996 alone. This resource will help users to understand this trend and the health claims made by supplement companies and to make educated decisions regarding their use. This site offers a revised version of an article which originally ran in the September-October 1998 FDA Consumer. The article addresses topics such as the definition of a dietary supplement, safety monitoring, understanding claims, and fraudulent products. An illustration of new requirements for dietary supplement labels and sources for more information are also provided.