Is there an otc pill or supplement you can take to reduce bad smelling gas?

Diet causing gas?: Since we don't digest the fiber we eat, intestinal bacteria will feed on it and make gas as a byproduct. Another reason could be lactose intolerance, in which one can't digest the lactose (milk sugar), so Lactaid tablets can help. Again, bacteria will feed on it. Drinking lactose-free milk and eating less fiber, should decrease gas. Intestinal infections, or using antibiotics, can also cause gas.