Introduction
Herbals are the most common type of dietary supplement. Herbs have been used medicinally since ancient times. For example, St. John's Wort was used to treat mood disorders as early the 5th century BC.
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The popularity of herbal medicines has been growing rapidly since the 1960s and today represents a multibillion dollar industry. Interestingly, over 100 of the pharmaceuticals currently used in conventional medical practice are derived from plants.
Today there are 1500 to 1800 herbals sold in the U.S. Although many of these supplements appear to be safe, some commonly-used substances have important side effects and interact both with standard pharmaceuticals and other supplements. Supplements received a lot of attention in the public media when ephedra was found to be linked to several deaths, and was subsequently banned by the Food and Drug Administration (FDA) in 2003.
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Herbals are just one type of dietary supplement as defined by the FDA. According to the FDA, a dietary supplement is defined as a product that contains one or more dietary ingredient such as:
* a vitamin or a mineral,
* an herb or other botanical,
* an amino acid,
* a dietary substance intended to increase the total dietary intake
* a concentrate, metabolite, constituent, extract
* a combination of the above ingredients
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