Supplement brand Now’s latest quality testing program flags discrepancies between methyl B12 potency claims and actual levels in the supplement, having surveyed 25 different brand samples purchased on Amazon in January. Notably, 11 brands exceeded their label claim of potency, with six testing over 120%. Additionally, 12 brands tested below 100%, with three showing potency between 90–100%, while three brands contained only 0–1% potency.
