I really haven't found any supplements:( Some use Beano, but I didn't find it did much for me.
BUT I have found a few things that work(for gas) for me: I do not drink with straws, I don't eat processed carbs(most important for me) and I sleep with my mouth closed. It took me a little while to figure out what foods are best for me, but I was really amazed at how much less of a problem gas it now
As far a odor, the only thing I can say is 'we are what we eat!'
Welcome to the forum~glad you found it!!