Product: Optimum Nutrition Gold Standard Whey Protein Serving size: 31.5g. (24g of protein per serving) Price: $59.36(5 lbs). $33.24(2 lbs) Where to buy: Amazon.com My Rating: 4.5/5 Optimum Nutrition Gold Standard Whey Overview. Fuel source, recovery, and great mixability all packed into one container. When you are supplementing with a protein powder, you want …