Due to its fast absorption rate, whey protein isolate is commonly used post-workout in the form of a protein shake. This is a critical time for a fast-acting protein as you want to replenish your depleted muscle tissues quickly for repair and rebuild. People who are on a weight loss diet and who exercise regularly should use whey protein isolate as the latter will help them in their weight loss goals as it's really effective, convenient and handy. Whey protein isolate contains glutamine and branched chain amino acids which are effective for building and preserving lean muscle mass as well as helping you recover faster after your grueling weight loss exercise routine. Naturally, you'll burn fat faster as your metabolism will increase due to more muscles in your body.

Whey protein isolate has considerably less fat, lactose, cholesterol and sugar or none at all as compared to whey protein concentrate so be sure to check well what kind of whey protein you're buying.

For affordability, effectiveness and quality, I recommend Optimum Nutrition 100% Whey Gold Standard, Double Rich Chocolate, 5 Pound which consists primarily of whey isolates and little concentrates. This is a great product which has been getting rave reviews over the years and 8 time award winner.