One thing metformin does is occasionally encourage cells to burn excess energy rather than store it. This may lead to extra cellular repair processes. I heard cancer rates were lower in metformin users and could extend life. Had my doc prescribe it to me 5 or so years ago.

I take it daily. There were mild GI side effects and weight loss at first, but my body adjusted and now it is BAU.

Haven't changed my lifestyle, can't know if it has made me more healthful. I still get colds and flu maybe once every other year.

Had a vaccine injury scare after the second jab. My health has been down since, can't know if Metformin is helping or hurting that situation - hopefully in the background helping me heal.