The use of herbal supplements has increased dramatically over the past 30 years. Herbal supplements are classified as dietary supplements by the U.S. Dietary Supplement Health and Education Act (DSHEA) of 1994. That means herbal supplements, unlike prescription drugs, can be sold without being tested to prove that they are safe and effective, however they must be made according to good manufacturing practices.
Often, herbs may be used together because the combination is more effective and may have fewer side effects. Health care providers must take many factors into account when recommending herbs, including the species and variety of the plant, the plant’s habitat, how it was stored and processed, and whether or not there are contaminants (including heavy metals and pesticides) present.
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