title: Assessment of niacin status in humans.
mesh_terms: D000328:Adult; D004912:Erythrocytes / Q000737:chemistry*; D006801:Humans; D008297:Male; D009243:NAD / Q000097:blood*; D009525:Niacin / Q000032:analysis*; D009752:Nutritional Status; D014364:Tryptophan / Q000097:blood*
chemical_list: D009243:NAD; D009525:Niacin; D014364:Tryptophan