Annu Rev Pharmacol Toxicol 45, 51-88 (2005)
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When cyanocobalamin enters your body, its converted into either methylcobalamin or adenosylcobalamin, which are the two active forms of vitamin B12 in humans ( Unlike cyanocobalamin, methylcobalamin is a naturally occurring form of vitamin B12 that can be obtained through supplements, as well as food sources like fish, meat, eggs, and milk (3, SUMMARY Cyanocobalamin is a synthetic form of vitamin B12 found only in supplements, while methylcobalamin is a naturally occurring form that you can get through either food sources or supplements
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Recommended injection sites include the abdomen (avoiding a 2-inch radius around the navel), the front of the thighs, and the back of the upper arms