Heres our answer How Long For B12 Injections to Work
The table below shows common IV B12 doses: Prescription Vitamin B12 Injection Protocols Prescription vitamin B12 injections are key for those with a deficiency
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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