Cyanocobalamin Synthetic Vitamin B12 As we have discussed, for many years B12 supplements mainly contained cyanocobalamin , a synthetic form of B12 that is not directly bioactive and is only found naturally in the body or diet in minor traces
[2] Grain-based foods can be fortified by having the vitamin added to them
For this reason, testing and clinical assessment are recommended before treatment
A serum B12 level test and, ideally, a methylmalonic acid (MMA) test should precede any B12 injection recommendation
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