title: Does purity of supplements count?
authors.forename: Samir K
authors.initials: SK
authors.lastname: Ballas
mesh_terms: D001205:Ascorbic Acid / Q000737:chemistry; D004340:Drug Contamination; D006801:Humans; D007981:Levorphanol / Q000737:chemistry; D008691:Methadone / Q000737:chemistry; D008517:Phytotherapy; D010936:Plant Extracts / Q000737:chemistry; D028321:Plant Preparations / Q000737:chemistry*; D011786:Quality Control; D016032:Randomized Controlled Trials as Topic; D014810:Vitamin E / Q000737:chemistry
chemical_list: D010936:Plant Extracts; D028321:Plant Preparations; D014810:Vitamin E; D007981:Levorphanol; D001205:Ascorbic Acid; D008691:Methadone