I'm gunna guess you mean Whey Protein Isolate?
The ideal source of whey protein for weight training athletes. Users reported no experience with digestive problems such as gas, bloating, and diaherra, as commonly associated with whey concentrate. Reported higher lean muscle gains with whey isolate over concentrate due to it's higher P.E.R. value. Which means, more weight is gained from every gram of whey isolate taken. Although twice as expensive as whey concentrate, the benefits out weigh the price. If one wants protein and not fat and carbs, then choose whey isolate. Mostly consumed by recreational bodybuilders and amateur athletes. Great for bodybuilders who are lactose intolerant.
Rice Protein
Rice Protein concentrate makes a good alternative away from animal proteins. i.e. whey, casein, milk, beef..etc..Use the rice protein concentrate after training or during mass and/or bulking phases. Rice has a relatively high glutamine and alanine content which would make this a great protein for cellular hydration (protein synthesis increased) and nitrogen transporter. Alanine is actually the main carrier of nitrogen to the muscle. Combine the rice protein concentrate with creatine...great combination...Why? high glycemic carbs, glutamine alanine, bingo faster more absorption creatine..!