GNC Burn & Define Vitapak is a scientifically formulated comprehensive nutrient support system. GNC's Burn & Define Vitapak provides nutritional support, promotes calorie burning, fuels fat metabolism, and helps regulate water balance. GNC's Burn & Define Vitapak contains our ultra-concentrated Total LeanMultivitamin that provides essential vitamins and minerals to help fill in any nutritional gaps that you may be missing from your diet. Our clinically researched Burn 60 has been proven to burn up to 60% more calories post workout. GNC's Burn & Define Vitapak features CLA and L-Carnitine to improve body composition, improve lean muscle tone and fuel fat metabolism. L-Carnitine also helps to reduce oxidative stress post-exercise. To help regulate excess water, this product features our scientifically formulated nature based herbal blend Waterex. Losing weight is stressful enough on its own. For over 85 years, GNC has been the leading global health and wellness brand providing the best in performance-inspired nutrition. Above all else, GNC aims to inspire people to live well.