Histology and histopathology, 17(3), 707714
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
Should vitamin B12 tablets be included in more Canadian drug formularies
A vitamin B12 injection is needed after gastric banding when oral supplementation has failed to correct a documented deficiency, serum B12 remains persistently low, the patient cannot adhere to daily oral tablets, or there are signs of neurological or haematological complications
But proper dosage, placement, and timing make a huge difference