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Arginine 200mg (IV or IM injection) This amino acid used to make nitric oxide, a molecule that facilitates the flow of blood to the penis during an erection, and is the most common amino acid found in sexual supplements

But if you are deficient, correcting that deficiency can restore the energy and metabolic function that low B12 drains, and that can make weight loss easier

See the AAAaAI review, a related PubMed case series and an FDA pharmacovigilance memo for more detail

"Cyanocobalamin reductase / alkylcobalamin dealkylase (MMACHC, Human)"

Like all good things, too much of any vitamin or mineral can stir up trouble