by taking bismuth subgallate or some over the counter drug called Devrom which I've never heard of. I've found Pepto Bismol works great, I don't know if it's ok to take it every day, but I don't care.
I'm in my 40's and I've suffered from severely smelly gas
. Now I have it more under control by preventing gas with Beano before every meal involving starches, carbs, fiber, sugar, anything difficult to digest. I avoid drinking soda because it makes me gassy, and of course I take Pepto Bismol daily for odor.
No doctor I've spoken to has ever taken this seriously, or given me any useful advice on this topic.