cyanocobalamin vs methylcobalamin b12 injections Are Shots Safe? Royal Palm Beach Medical Group Compounded Cyanocobalamin (Vitamin B12) Injection

Factors that can increase the risk of B12 deficiency include being over the age of 75, digestive absorption issues, autoimmune conditions, and certain diets like vegetarianism and veganism

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In the stomach, hydrochloric acid and pepsin release B12 from food proteins, after which intrinsic factora glycoprotein produced by gastric parietal cellsbinds to the vitamin

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However, "unlike most other vitamins, B12 is stored in substantial amounts, mainly in the liver, until it is needed by the body," according to Merck Manuals Consumer Version