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
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01 / 01 MIC B12 and Injectable VitaminsRef
Of course, older adults, people over age 50 in particular, tend to have the lowest B12 levels, though vegetarians and those who have undergone gastric bypass surgery are also at a higher risk