Natural: Synthetic cyanocobalamin requires conversion in the liver to become active, which means some people may not absorb it efficiently
Kraus D, Yang Q, Kong D, Banks AS, Zhang L, Rodgers JT, Pirinen E, Pulinilkunnil TC, Gong F, Wang YC, Cen Y, Sauve AA, Asara JM, Peroni OD, Monia BP, Bhanot S, Alhonen L, Puigserver P, Kahn BB
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These include- Aged over 75 Decreased stomach acid Frequent use of antacids Autoimmune conditions affecting the stomach High doses of folic acid Stomach surgery Prolonged use of metformin Adoption of a vegan or vegetarian diet Excessive alcohol consumption How Does Vitamin B12 Benefit Your Body