Should I take vitamin B12 if my serum B12 level is high?

Common contributors to Vitamin B12 deficiency include: vegetarian/vegan diet stomach acid medications antibiotics oral contraceptives aspirin (ASA) blood sugar medications such as metformin  Normal serum vitamin B12 levels range between 200-900 pg/mL. Serum B12 levels may not accurately reflect tissue B12 levels. What this means is that you could have a tissue level deficiency that…

Vitamin B12

Vitamin B12, also called cobalamin, is a water-soluble vitamin that plays a key role in the functioning of the brain and nervous system, the formation of blood, cellular metabolism, DNA synthesis and regulation, fatty acid synthesis and energy production.  The B12 required for human health has to come from bacteria since fungi, plants, and animals are…