I claim that well-absorbed supplements can have deleterious effects. How could that claim be straightforwardly tested? Whey protein isolates are extremely well-absorbed whereby if my claim is correct supplementing with whey protein isolates should have very negative effects. Individuals taking whey protein isolates will be overcome by a brain fog. Whey protein concentrate is not formulated for better absorption so whey protein concentrate, which can have no added whey protein isolates or added hydrolyzed whey proteins, can have positive effects. The test will in all probability give clearer results if individuals have some chronic illness. Labels must be looked at carefully. Frequently whey protein isolates are added to what is called whey protein.