I also see ads for Metformin as a "longevity" and "weight loss" drug. I worry for my mom and other diabetic members of my family potentially not being able to get it if it goes viral like this.
These shortages mostly happened because of a patent monopoly.
It wouldn’t surprise me if in a couple decades some non-trivial percentage of the folks using it for longevity end up with PSP, which is a fatal and untraceable disease.