I am 31 a non-diabetic and began taking 500mg SR Metformin for longevity purposes 6 days ago after hearing Dr. David Sinclair talk about it's benefits and doing a lot of my own research. Not interested what people think about this and their judgements on it (it is what it is, and is my choice) but I wanted to get a little advice from people if possible. I’m very athletic, have low body fat and train every day (martial arts). It’s pretty taxing on the body but I’ve been doing it years and am pretty used to it so never usually ache more than a day even after I’ve trained hard. However since taking the metformin I’ve noticed I’m a lot more achey and didn’t feel as strong when I have trained lately. Sometimes I go through periods like this and rest a little and I’m okay again. But I can’t help thinking it’s no coincidence. I've also developed flu like symptoms over the past couple of days, which I think are related also. When researching, I'd read about the possibility of increased lactic acidosis on the medication and didn't know if this was anything to do with it. My question is will these increased aches/decreased athletic performance subside after I acclimate to the medicine? I read that side effects should go away with time, but if not I'll just stop taking it as my performance athletically is more important to me than the possible longevity benefits of Metformin. Any advice also very welcome and thanks.