Methylmalonic Acid Methylmalonic Acid (MMA) is recognized as the best way to test Vitamin B12 levels as it measures B12 at a cellular level, it is possible to have normal or even high levels of B12 in the blood but be low at a cellular level
Since vitamin B12 is found in many foods, deficiency is more common in the elderly, strict vegetarians, or those who take oral contraceptives or medications for gastric disorders or insulin resistance
This protein helps us absorb vitamin B12 into our blood
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It does not matter for B12 injections, which bypass the digestion process and directly enter the bloodstream