Ultimate lean gainer you've been waiting for! Mutant Mass is a serious formula, designed with only hard working athletes in mind, who demand power, absolute size and all out strength.

Ultimate lean gainer you've been waiting for! Mutant Mass is a serious formula, designed with only hard working athletes in mind, who demand power, absolute size and all out strength.

New, extremely effective gainer designed especially for hardgainers to put on muscle mass in the shortest time possible. Mutant Mass Extreme was developed in collaboration with professional athletes and bodybuilders who demand strength, constant muscle growth, rapid recovery and maximum performance.