GNC B-Complex Plus Energy combines 8 key B-vitamins with 100 mg of caffeine to fuel mental alertness and performance. B-vitamins help to convert food to fuel and support metabolism and energy production. Because your body cannot store B vitamins for long periods of time, providing your body with adequate amounts is very important. Caffeine also has thermogenic properties to support calorie burning. This product is gluten-free, contains no sugar, corn, soy, dairy, sodium, artificial colors, or flavors.