Whey protein isolates are 90% pure protein by weight. They are the purest and most expensive form of whey protein that exists. That's why they are the first ingredients you read on the 100% Natural Whey Gold Standard label. By using whey protein isolates as the primary protein source, they're able to pack 24 grams of the purest, muscle-building protein per serving, with a lot less of the fat, cholesterol, lactose and other stuff that you can do without. What's more, 100% Natural Whey Gold Standard contains no artificial flavors, colors, or sweeteners.

The Regular version is also available.

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100% NATURAL Whey Protein (Optimum Nutrition) - Average rating 4.8 (21 reviews)  - Write a review Show Reviews Reviews (17) (4) (0) (0) (0) See all 21 reviews   3 of 3 people found the following review helpful. April 06, 2007 Reviewer: Kevin in District of Columbia I'm going to make an educated guess and say that this protein is probably one of the most popular whey proteins being sold today - and with good reason. It's a simple formula of concentrate/isolate protein. It tastes good. It mixes easily (trust me, others don't). It's reasonably priced. I've seen everyone from bodybuilders to boxers supplementing with this brand. The truth is that pure whey is relatively easy to cull from milk, and it is relatively easy to maintain good quality, so the production costs are not very high. By its very nature it is not an incredibly difficult or technical process. This makes you wonder why a thousand other brands are marketing their whey as "pharmaceutical grade" and charging twice as much. 100% NATURAL Whey Protein is a good value. This review is specific to 100% NATURAL Whey Gold Standard Protein, Chocolate Was this review helpful to you? Yes  No 1 of 1 people found the following review helpful. April 23, 2008 Reviewer: Russel in New Jersey I've been using this product for a decade. While other products often clump up or overly thicken unless a blender is employed, Optimum Nutrition's proteins dissolve even under the mere persuasion of a spoon in a glass. Vanilla tastes great with OJ or milk, chocolate works great with water or milk (and I sometimes add fortified peanut butter too for a taste treat) Great product and the best value for your dollar, too. A one-two punch that can't be beat. Was this review helpful to you? Yes  No August 06, 2011 Reviewer: A customer in Florida I drink this everyday with soy milk and a few pieces of frozen fruit, holds my hunger away for about 3 hours. No after taste and the flavor is good, like it better than the vanilla. I do not like chocolate so wouldn't even try that. This review is specific to 100% NATURAL Whey Gold Standard Protein, Vanilla Was this review helpful to you? Yes  No February 01, 2011 Reviewer: ryan in Oregon Great product, faster results than others I have tried. More protein, less fat and calories per serving than others as well. Highly suggest trying this product. Also Netrition rocks! Great service, fast shipping. Thanks! Was this review helpful to you? Yes  No May 12, 2010 Reviewer: CORT in Alabama A great product. Mixes easily, not grainy, good taste. Was this review helpful to you? Yes  No See more reviews