This is actually a thing I wish existed, but I don't have time and energy to make it right now. I'd pay $25 a month or more. Basically it's an application that lets you do self-experiments like this, properly blinded and with good statistics. A challenge-dechallenge-rechallenge study is one of the ones I like, but if you want to do one you essentially have to design the study anew each time, and it would be convenien…
https://apps.apple.com/us/app/reflect-track-anything/id64638...