DOES IT EXIST?
In my left hand, I hold two Extra Strength Tylenol caplets. In my right, two CVS-brand extra strength non-aspirin pain reliever. Each hand contains 1000 mg of acetaminophen. Each hand contains the same exact chemicals as the other hand. One would think that they work exactly the same in my body. But the CVS brand caplets don’t work for me. Is there such thing as a reverse placebo effect?