WHAT IS IN COMPLETE LEAN MASS™? Complete Lean Mass™ is perfect for anyone who wants to add muscle mass, but at the same time avoid adding unnecessary body fat. Complete Lean Mass™ is packed with high quality protein & carbohydrate sources, avoiding sugar-based carbohydrates & unhealthy fats found in most weight gain supplements. All of this ensures that Complete Lean Mass™ promotes only quality weight & muscle mass – all in one convenient & great tasting