I had a client call me to discuss caffeine as an ergogenic aid, I informed him statically most people get a benefit, but 1/4-1/3 actually see no or worse performances. I warned him to test it before using higher doses during a race. All he heard was “most people get a benefit” so during his A race the next week, he load up on the caffeine and had his worse race of the season. I do all the research so you don’t have to.

It’s the most reliable performance booster in the world?unless you have the wrong genes