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A more sensitive method of screening for vitamin B 12 deficiency is measurement of serum methylmalonic acid and homocysteine levels, which are increased early in vitamin B 12 deficiency

doi: 10.1016/j.cell.2007.08.012

1 2 "Vitamin B12 in meat and dairy products"

While energy drinks are a choice these days as a substitute for coffee it's important to note that those containing cyanocobalamin (an inactive form of B12) may not be as beneficial as those with active forms like methylcobalamin, adenosylcobalamin or hydroxocobalamin, for better effectiveness

Compounded Methylcobalamin injections are prepared outside the FDA approval process and are not reviewed by the FDA for safety, effectiveness, or quality