Syntha-6TM Isolate is BSN®"s latest ultra-premium protein powder, made with 100% isolate protein sources. A 50/50 blend of whey protein isolate and milk protein isolate (a high-quality source of slow-digesting casein), the formula"s unique IsolastTM protein matrix delivers a mix of fast- and slow-release proteins that promotes a moderately-paced release of amino acids to fuel active muscles.