title: To supplement or not to supplement, that is the question.
authors.forename: P R
authors.initials: PR
authors.lastname: Taylor
authors.forename: D
authors.initials: D
authors.lastname: Albanes
authors.forename: J A
authors.initials: JA
authors.lastname: Tangrea
mesh_terms: D002986:Clinical Trials as Topic; D004032:Diet / Q000009:adverse effects; D019587:Dietary Supplements / Q000009:adverse effects*; D009369:Neoplasms / Q000209:etiology / Q000517:prevention & control*; D012307:Risk Factors; D014131:Trace Elements / Q000009:adverse effects*; D014815:Vitamins / Q000009:adverse effects*; D019207:beta Carotene / Q000009:adverse effects
chemical_list: D014131:Trace Elements; D014815:Vitamins; D019207:beta Carotene