The Athlete's Isolate American Isolate is a perfect matrix of five different protein sources that utilize different digestion rates to continue building lean muscle mass for extended periods of time. If you're focused on building lean muscle, then American Isolate is the perfect addition to your diet. Our American isolate is manufactured using an engineered matrix of micro- filtered whey protein isolate, whey protein concentrate, whey peptides, sweet whey, and skim milk powder. This combination of ingredients helps to create superior taste, fantastic solubility, and a high concentration of branched chain amino acids.*
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