I am someone who has taken 3 x 500mg daily since my type 2 diagnosis over four years ago. Find below an article that describes in detail how Metformin works and other benefits it can give. If you don’t want to read the whole article just read the contents of the blue boxes.
Personally I suffer no side effects from it, so am happy to continue taking it and maybe it’ll benefit me in more ways than just for my diabetes. I also like that I can perhaps be a little less strict with carbs than diet only type 2s.
https://www.lifeextension.com/magazine/2001/9/report_metformin
After doing plenty of research and having said all of the above, I do think this is a decision for you to make with your health carers.