GNC Vitamin B-12 500 mcgGNC Vitamin B 12 500 mcg (100 Vegetarian Tablets) GNC Vitamin B 12 500 mcg is a high quality dietary supplement designed to support carbohydrate metabolism and energy production, as well as red blood cell formation. Each vegetarian tablet contains 500 mcg of Vitamin B 12, aiding in overall health enhancement. Product Features: Supports Carbohydrate Metabolism: Vitamin B 12 aids in converting carbohydrates into energy, supporting daily energy levels.