My 16-month theanine self-experiment

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 convenient to run multiple at once if that's possible.

I'm not interested in generalizing, I just want to know if (for example) taking Vitamin D every day at 1000 iu is enough, or whether I should be taking more or less. I can get labs done on this, of course, but again I'm more interested in subjective wellbeing than blood levels beyond avoiding deficiency or hypervitaminosis.

Maybe such an app exists and I simply don't know about it.

you want a service to: mail out a 30-pack of daily pills, there's an app where you record your mood/whatever, and then at the end of it, reveal which days were VitD and which was collagen?

how much would you pay for this?

Skip the pills. Make the app.

how do you blind the contents of the pills unless someone else does it?