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Methionine also aids in the synthesis of important molecules like proteins and other amino acids

Because cyanocobalamin is cheap to produce, its typically used in vitamin B12-fortified foods and is the most commonly supplemented form of vitamin B12

[PubMed Citation] Borron SW, Baud FJ

Unlike vitamins A, D, E, and K which are stored in fat, B vitamins are water soluble and not stored in large quantities

It all comes down to absorption

Intramuscular injection bypasses this entirely, delivering B12 directly into the bloodstream via muscle tissue for near-complete bioavailability making it the gold standard for treating deficiency and supporting optimal B12 levels