Ran across this article while researching metformin. The gist of what was written aligns with what I’ve read previously, though here it’s in a condensed form much easier to digest.
https://www.wired.com/story/this-pill-promises-to-extend-life-for-a-nickel-a-pop/
https://www.wired.com/story/this-pill-promises-to-extend-life-for-a-nickel-a-pop/