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…