Ultimate Nutritions IsoCool Bioactive Whey is produced exclusively through a new and innovative technology, ColdPure Ultrafiltration. ColdPure Ultrafiltration isolates the native whey protein in a highly bioactive form using an advanced low temperature Ultrafiltration process. ColdPure Utrafiltration produces a superior Bioactive Whey that is non-denatured and contains the hightest content of essential amino acids (EAA) and branched chain amino acids (BCAA). Look for the ColdPure logo to assure yourself of the highest quality bioactive whey possible.