GNC Vitamin B-12 - 1500 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 - 1500 Mcg Is Kosher And Gluten Free. Contains A 90-Day Supply Of 90 Capsules No Artificial Colors Or Flavors No Sugar, Starch, Wheat, Corn, Soy, Or Dairy Sodium Free | GNC Vitamin Bvitamin B -12 1500 Mcg Vitamin B - 90 Capsules (90 Servings)