RSN Amino Mass is a complete Nutrient and Complex Carbohydrate Rich Gainer With High Quality Protein. RSN Amino Mass Loaded with the latest performance Nutrients. RSN Amino Mass is a true giant among Gainers. If You can use, RSN Amino Mass helps you to pack on great mass like never before. That's because it is developed for great gain of muscle mass of bodybuilders, athletes & lin thin individuals.