Are there any regulations on herbal supplements?

In 1994, the Dietary Supplement Health and Education Act (DSHEA) was passed. The DSHEA defined dietary supplements as vitamins, minerals, herbs, botanicals or amino acids used to supplement the diet to increase total dietary intake.

According to the DSHEA, the U.S. Food and Drug Administration (FDA) is prohibited from regulating dietary supplements as food additives. Makers of dietary supplements are permitted to make structure and function claims, but not therapeutic claims. For example, a St. John's wort product can claim to enhance mood, but it cannot state that it treats depression. In addition, all dietary supplements must have the following warning about the functional claims: 'This statement has not been evaluated by the Food and Drug Administration.'