Why buy Mutant? Mutant products are designed to improve performance, enhance the development of muscle mass and optimize recovery processes following training sessions. Starring among the products which make up the range is Mutant Mass, the leading weight gainer on the sports nutrition market. Since 2006, Mutant Mass has been the number one choice of body builders and weight lifters in more than 85 countries throughout the world. The company places great importance on innovation and developing its formulas, and so has dedicated years to experimenting, research and development to be able to offer the most original and powerful sports nutrition supplements for clients who only want the best.