1 – Be Rich.
2 – Don’t smoke (and by inference, similarly health impacting things).
3 – Avoid work and stress all costs.
Bonus – Have a decent social life.
Doesn’t matter how much metformin you mainline if those pre-requisites aren’t in place.
This article could also be named “How to cure psychiatric diseases”.
Edit: Sorry, this popped into my head because I noticed Amazon Prime now has health insurance for $199 a year, and in their banner promoting it is a bottle of Metformin.