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1 Within each of these categories, products may be pure single entities of known or unknown chemical constituents, mixtures in which all or some components are known, or mixtures of unknown chemical components. Many of the substances currently marketed as dietary supplements fall into the following categories: vitamins, minerals, herbs or other botanicals, amino acids, animal-derived products, hormones and hormone analogs, and enzymes, as well as concentrates, metabolites, constituents, or extracts of these. This is despite research-based dietary recommendations supporting the position that the best nutrition strategy for optimal health and reducing the risk of chronic disease is to obtain adequate nutrients from a wide variety of foods (Hunt, 1996 Hunt and Dwyer, 2001). population has been a growing trend since the 1970s (Bender et al., 1992 Subar and Block, 1990), suggesting that Americans are becoming more receptive to alternatives to conventional food sources for nutritional health benefits (ADA, 2000). Vitamin and mineral supplement use by the U.S. In 2002, sales of dietary supplements increased to an estimated $18.7 billion per year, with herbs/botanical supplements accounting for an estimated $4.3 billion in sales (NBJ's Annual, 2003). The Food and Drug Administration (FDA) estimates that more than 29,000 different dietary supplements are now available to consumers, and an average of 1,000 new products are introduced annually (Sarubin, 2000).Ĭonsumer interest in health and self-care has been identified as providing the impetus for the expanded market of a wide range of products that includes dietary supplements (Prevention Magazine, 2001).

dietary supplement manufacturers marketed about 4,000 products (CDSL, 1997).

At the time DSHEA was enacted, an estimated 600 U.S. Congress passed the Dietary Supplement and Health Education Act (DSHEA) of 1994 (P.L. A significant number of new dietary supplement products have appeared in the marketplace since the U.S.