Lebih dari 90% asupan vitamin A preformed adalah dalam bentuk ester retinol, biasanya sebagai retinil palmitat.Utilizing vitamin B12 being a cofactor, folic acid can normalize superior homocysteine concentrations by remethylation of homocysteine to methionine by means of methionine synthetase.H? tr? b? sung ??y ?? các lo?i vitamin và canxi cho s?