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Serious reactions are rare, but an allergic reaction is possible with any injection, which is another reason a first dose in trained hands is sensible
Rarely, hypersensitivity reactions can occur, for instance, urticaria (hives) or other allergic-type reactions have been reported in isolated cases
When optimized and properly administered, B12 plays a crucial role in everything from red blood cell production to nerve function to metabolism
I recommend: at least 2,000 mcg (g) cyanocobalamin once each week, ideally as a chewable, sublingual, or liquid supplement taken on an empty stomach or at least 50 mcg daily of supplemental cyanocobalamin or a serving of B12-fortified foods three times a day, each containing at least 190 percent of the Daily Value listed on the nutrition facts label Those over 65 years of age should take at least 1,000 mcg (g) cyanocobalamin every day
People with vitamin B12 deficiency show different recovery times, ranging from days to months before feeling fully well
