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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

A low reticulocyte count can be a sign of B12 deficiency because the bone marrow cannot make red blood cells without B12

The subcutaneous layer may be less uniform, with areas of tissue thinning alternating with areas of normal thickness

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