Optimum Nutrition Gold Standard 100% Isolate whey protein powder delivers 25g of pure whey protein isolate per serving, naturally containing BCAAs and glutamine to support lean muscle gain and recovery. Ultra-filtered for exceptional purity, this low-sugar, low-fat formula is perfect as a pre or post workout shake. Available in a variety of delicious flavours including chocolate, vanilla and strawberry. Mix easily with water or milk for a smooth, great-tasting protein drink that helps maintain muscle mass and normal bones.*.