title: Stability of folic acid activity in serum.
mesh_terms: D001205:Ascorbic Acid; D001793:Blood Preservation; D004355:Drug Stability; D005492:Folic Acid / Q000097:blood*; D005615:Freezing; D006801:Humans; D013997:Time Factors
chemical_list: D005492:Folic Acid; D001205:Ascorbic Acid