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 b-12 1500 mcg - 90 capsules (90 servings)