Earlier quoted context omitted.
The side effects can be pretty nasty. I took it for 6 months and the stomach pain and diarrhoea never went away. Berberine however acts on the same pathways as metformin and doesn’t cause the side effects. As a bonus you don’t need a prescription to take it.
> stomach pain and diarrhoea never went away I always wondered if that's what caused the weight loss: destabilization of the digestive system, so you grow to fear overeating/eating crap. Dunno how one can say they work on the same pathways: we're not really sure how metformin does its thing.
I never felt digestive issues when taking metformin, only a feeling of having less energy.