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Optimum Nutrition Gold Standard 100% Whey contains Whey Protein Isolates (WPI), which are the purest form of whey protein that currently exists. WPIs are costly to use, but rate among the best proteins that money can buy. That’s why they’re the first ingredient you read on the Gold Standard 100% Whey label. By using WPI as the primary ingredient along with premium ultra-filtered whey protein concentrate (WPC), we’re able to pack 24 grams of protein into every serving to support your muscle building needs after training.