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When given by a trained professional, B12 injections are widely considered safe and well-tolerated

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

Those on a vegan diet naturally eliminate protein sources such as chicken, eggs (the health benefits of eggs are endless and might warrant inclusion in your diet), and fish, which have high amounts of B12

NAD metabolism in aging and cancer