[nradov]

I don't know about bacteria, but post viral syndrome has been measured for decades with other viruses.

https://pubmed.ncbi.nlm.nih.gov/3320358/

Metformin doesn't have any "magical" anti-aging properties. It is effective for treating certain metabolic conditions such as type-2 diabetes but it has never been proven to extend lifespan in otherwise healthy humans (or any other higher primate). There are some significant negative side effects.

https://peterattiamd.com/ama45/

[darkerside]

I meant the magical part as tongue in cheek. I guess that doesn't come across well in text. My conjecture is that the anecdotal or limited evidence could be conflated with an improvement of latent infections, which would be an inconsistent effect.