And we have experience with our product - olive oil. It actively works with the pain thresholds in the muscles, like an anesthetic. And it changes the intestinal microflora, which allows you to quickly absorb nutrients.
I managed to find material about doping published in Harvard. There is a small fragment about the history of doping, including the ancient tradition.
In this work they mention Galen who describes various recipes there , herbs and mushrooms. What can be said, from the very beginning of sports competitions, people have used various substances to win. I think that the use of doping could have come from the military tradition, when before a fight to increase endurance or strength, you could drink a decoction or chew a plant root.
In the modern world, although I'm not an expert here, if we talk about high-performance sports, there are probably no disciplines completely free from the use of drugs. I don’t know about go, checkers and chess, but for sure there are some substances there to increase attention and concentration.