Mutant mass is a very good mass gainer if yoursquore what we call a hard gainer these are people who find it hard to put on weight and need to eat a lot of calories to add mass they needr the mutant mass gain formula features the iso stack 10 which is an ultimate protein mix containing a blend of 10 superior muscle building proteins and bcaasr mutant mass also uses a clean carb low gi carbohydrate mix which is low in sugar and stacked with a high molecular weight sugar free vextragot