Gluten-Free. For hard gainers, size and strength are easier lost than gained. Size and strength are lost when there is a catabolic gap and too few calories are consumed. This catabolic gap is the difference between the nutrition needed to gain and the calories actually consumed. Muscle Milk Gainer helps provide the calories needed to close the gap, so you can achieve and maintain the size you work so hard for. Milk Gainer's Protein System is designed to deliver protein over an extended period of time. The Protein System includes fast acting whey proteins (Whey Concentrate, Hydrolysate and Isolate) and the slower acting casein proteins (Milk Protein Isolate, Calcium Sodium Caseinate and Micellar Casein). Together, this blend of premium proteins is formulated to provide hours of gaining potential. Carbs are burned for muscle energy so protein is "spared" for its primary job: muscle repair and growth. Additionally, carbs help activate the powerful growth promoting hormone insulin that helps trigger transport of the amino acids (from digested protein) into muscle tissues. Put in the hard work and Muscle Milk Gainer will help close the nutrition gap so even the hardest gainer can make progress. Since we founded CytoSport in 1998, we've been dedicated to working with sports scientists, coaches and trainers to redefine protein enhanced products for active lifestyles and serious athletes-supporting performance when it matters. Over the years, we've expanded to create a comprehensive line that encompasses the athletic experience from preparation, to hydration, to recovery. Our products are among the very few that are manufactured in a NSF International GMP for Sport Registered facility. Our facilities are also inspected and regulated by the FDA. We carefully manufacture our powder products and ready-to-drink pre-blends onsite at our corporate campus in Benicia, California. Making efficacious products for athletes and active lifestyle individuals requires responsibility on all fronts. As our business has grown, so has our footprint. We have made environmental sustainability a focus and driver in everyday decision making. For more, please visit our website. Through it all, CytoSport has been committed to one thing, building athletes from the inside out.