How much vitamin B12 should a diabetic take?
In the US, it is currently believed that adults with type 2 diabetes that are over 50 should take 2.4 µg of synthetic vitamin B12 daily either in supplement form or in fortified food. How much B12 should a diabetic take with metformin? All individuals age 14 or higher need 2.4 mcg B12 daily. Women who are pregnant or nursing will need slightly more. Mandatory supplementation with B12 has now been proposed for those taking metformin.