GNC Vitamin B-12 - 500 mcg: Carbohydrate Metabolism and Energy Support Vitamin B-12 is essential for carbohydrate metabolism & energy production and is required for red blood cell formation.* GNC's Vitamin B-12 - 500 mcg is kosher and gluten free.  Contains a 100-day supply of 100 vegetarian tablets No artificial colors or flavors No preservatives, wheat, soy, or dairy Sodium free