Uncertainty with unregulated products.
Feldman
S
S
D004340:Drug Contamination; D004365:Drugs, Chinese Herbal / Q000737:chemistry; D006801:Humans; D004366:Nonprescription Drugs / Q000737:chemistry*; D012871:Skin Diseases / Q000188:drug therapy*
D004365:Drugs, Chinese Herbal; D004366:Nonprescription Drugs