Optimum Nutrition Gold Standard 100% Isolate

Excellent product. Mixes well/tastes good with water and even better almond milk

I have been using whey for quite some time and shifted to 100% isolate the on protein taste is noticeably bitter, to the point that it is hard to down rn. I have chocolate bliss flavour currently and maybe it is a flavour specific issue, i won’t be buying another from on so guess I’d never know! Corporate greed is destroying this I’ve loved brand

I've been using Optimum Nutrition protein powder for many years now, and it's the one product I consistently come back to. Over time, I've tried a variety of brands and blends, but nothing matches the reliability, taste, and quality that ON delivers. More importantly, it’s always been effective. It helps support my recovery after workouts, fits seamlessly into my daily routine, and I genuinely notice the difference when I’m using it regularly. The consistency in quality over the years is what really sets it apart. Highly recommend to anyone from beginners to experienced lifters. It’s a staple in my fitness journey, and I don’t see that changing anytime soon.

It doesn’t dissolve well - bad experience The vanilla flavor was actually more satisfying

This is the best value pure isolate I can find. I was previously using the vanilla soft serve flavor and loved it's neutral taste. I can not stand the rich vanilla flavor. Far to intense in odor and flavor. Please bring back the other flavor!

The best protein powder we have ever used and we go through one of these a month. Great product.

Flavor is Super great! I tastes rich and creamy....

I did not read the label thoroughly and bought this stuff containing sucralose. For being a health product why add a carcinogen.

I absolutely love this product! As someone with lactose intolerance, I’ve struggled to find a whey protein that doesn’t upset my stomach. Many others just didn’t work for me, but this one has been a game-changer. It feels great to finally have a protein that I can enjoy without any discomfort. I can’t recommend it enough, especially for anyone dealing with similar issues. It’s truly made a difference for me!

I can see the results I was looking for in my shape

I’m having a terrible experience with my first purchase on the site. They gave me an estimated delivery date, but it has already passed by several days. I've emailed customer service, and their response is that UPS doesn’t have a set delivery timeline, meaning I could be waiting six days or six years. I’ve been trying to understand the issue since I need the product and find it hard to believe there's no estimate, but customer service keeps insisting there's no timeline. I’ve paid for the product, but I haven’t received it.

I've been taking this product for years and I truly love and recommend it. The flavor is unbeatable and I can see the great effects on my body. Simply amazing!

This product is not at all good, it tastes bitter and no one is helping out in the company to exchange or refund. And I have bought two of them and both have same issue...

This is a consistently highly quality product without upsell, hype, and marketing. You get a higher quality isolate with ON compared to most competitors at a reasonable price. They third party lab test which is essential for anything that you use on a consistent basis.

Absolutely love it! Tastes great, dissolves in water easily. This is BY FAR the best protein powder I've ever used. I will be a customer for life.

This is a consistently excellent product, It mixes well with a spoon, tastes great, it is a big part of my workout routine

Great protein powder. Mixes well and is gentle on my stomach! The isolate is a great alternative to the traditional whey. The flavor is also delish!

So good! Easy to digest, dissolves without any grit. Flavorful

So good! Easy to digest, dissolves without any grit. Flavorful

Amazing taste, light easily mixed with water, will buy again

Since using this product I no longer experience symptoms related to my lactose intolerance. It tastes great, I wish it came in larger sizes.

It has become an integral part of my daily nutrition, conveniently supplementing my protein intake. The variety of flavors adds a twist to my daily smoothies.

The chocolate flavor is very smooth and great. The power is easy to mix up. Great product!

I use this every day in my protein shakes that I make every morning before going to a workout, hiking or my volunteer work. Great stuff.

Great product for a lower calorie whey protein option. Tastes great and mixes well.

By far one of the best vanilla flavored isolate I’ve tasted in a while. Mixes well and tastes great with both milk and water. Will order again!