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BMC Medicine published a study on herbal supplements. Most of the supplements studied were of low quality, a third did not contain at all the herb claimed but, e.g., rice power or laxative. A third contained unlisted substances.[24][25] Some supplements were contamined by rodent feces and urine.[22] Only 0.3% of the 55,000 U.S. market dietary supplements were studied so that their common side effects are known.[21] |
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