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Look for standardized herbal supplements. The U.S. Pharmacopeia's "USP Dietary Supplement Verified" seal on a supplement indicates the supplement has met certain manufacturing standards. These standards include testing the product for uniformity, cleanliness and freedom from environmental contaminants, such as lead, mercury or drugs. Other groups that certify herbal supplements include ConsumerLab.com, Good Housekeeping and NSF International. Although each group takes a slightly different approach, the goal of each is to certify that herbal supplements meet a certain standard. Don't assume that all herbal products on the market are safe. Even the groups that test herbal supplements aren't obligated to report products that fail to live up to their standards.