I dropped Optimum Nutrition and many others long ago. Too many fillers, GMO, and other trash in there. I exclusively use PROMIX unflavored whey protein isolate. I also stay away from flavors because they often taste too synthetic and just add more "stuff" and rob you of the actual product. The whey protein isolate is also very easy to digest and that's important to me because I'm lactose intolerant.
https://promixnutrition.com/products...rotein-isolate