All I can say is don’t take metformin if you’re worried about farting. Otoh I’ve been reading that it’s something of a wonder drug that extends your life expectancy and quality of life, though perhaps at others’ expense where the latter is concerned…

Otherwise, I do know of a Japanese folk remedy that involves cooking any bean dish with some kombu–a type of hard dried seaweed not to be confused with the rather faddy kombucha, which I think is made from mushrooms or some kind of yeast? You don’t even have to eat the kombu but toss it aside like a bayleaf, though it is edible. Then again, there is always beano.