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In vitamin B 12 deficiency, the mutase reaction is impaired, causing accumulation of D-methylmalonyl-CoA, which is converted to methylmalonic acid

Sukhotnik I, Slijper N, Karry R, et al

doi: 10.1186/s41936-020-00148-0 14

Its muscle building properties make it a favorite among weightlifters and bodybuilding professionals
