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According to the Office of Dietary Supplements at the National Institutes of Health, the average adult age 19 or older needs 2.4 mcg of B12 daily (or 2.6 mcg for pregnant women and 2.8 mcg for women who are breastfeeding)
energy production
Vitamin B 12 is available only in animal foods (meat and dairy products) or yeast extracts (such as brewer's yeast)
Vitamin B-12 deficiency in the elderly: current dilemmas
Although cyanocobalamin is more readily absorbed, much of it is excreted through the urine before it can reach the cells Cyanocobalamin vs Hydroxocobalamin In comparison to hydroxocobalamin, cyanocobalamin has a significantly worse absorption rate and storability, which is why today mostly hydroxocobalamin is used in B12 injections
Lower abdomen The lower abdomen is a common injection site for hCG
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