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Although generally marketed as "natural" and "herbal" in nature, many contain contaminants in the form of heavy metals or conventional western medications.
Studies have found, among others, cadmium, cobalt, copper, iron, manganese, nickel, lead, zinc, and mercury in<unk><unk><unk> s
Studies have found, among others, cadmium, cobalt, copper, iron, manganese, nickel, lead, zinc, and mercury in<unk><unk><unk> s
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