Optimum Nutrition - Pro Quench
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Based on 1 year's data from Mar 22, 2026 How it works
RonCheesex 1.0The only ON flavor that made it on their clean list was vanilla ice cream, out of the ones they tested. The study specifically called out chocolate flavors for testing higher for contaminants. If you go to the bottom and click on the protein powders used in the study, you'll see that no chocolate flavors got their "clean" label. Many of the powders with the clean label are either vanilla or unflavored. I saw one mango flavor that made the list.
-BabysitterDad- 0.0I’m using ON, but Strawberry. Just a personal preference, Strawberry over Chocolate.
I thought it’s quite ok. Personally, I don’t feel it taste artificial. I mix my protein powder with Meiji milk.
MusingNotAbusing 0.0I use the strawberry ON one and it's great. Tastes like Angel Delight!
Raitoumightou 0.0ON strawberry, some of ON flavours are very overpowering and can leave you nauseous (chocolate, cookies and cream).
vicky199017 0.0Optimum nutrition strawberry and double chocolate and their protein bars.
802ScubaF1sh 0.0Our Costco almost always has the Kirkland, ON, and Orgain plant powders for a great deal. Look for the 'Aussie Bites' in the snack section, the ingredients / protein is pretty crazy for the small bites.
Alive-Trust-1980 0.0Hi. I have tried GNC and ON and didn't like both. How is MB in terms of quality ? Heard the taste is good.
alonso240 0.0Doesn't mix as well as ON, messes with my stomach, and doesn't taste as well either. I bought a bag of the Kirkland powder to try, boy it was tough to get through. The wife and kids didn't really like and were more than happy to go back to ON.
AvianTralfamadorian 0.0I’ve been happy to drink either, but I prefer ON because it has a stronger chocolate flavor. The Kirkland does live up to its flavor name because it does have a creamier flavor than the ON. I buy whatever is cheaper per oz at the time.
b0redcanuck 0.0It’s slightly more expensive but I switched to Diesel from Perfect Sports. Leanfit and ON are 24 grams of protein per 32 or 33 gram serving, which is only 72-75%. Diesel is 27 per 30, which is 90%. It’s a whey isolate which I digest much better and I believe the lower amount of fillers also helps that. I wait for a sale at Healthy Planet as it usually drops to $90 for a 5lb tub. Best tasting protein and highest macros in the market in my opinion.