Chlorophyll tablets turn your poop green, which is fine, but can weird you, or a nurse or caretaker, out if they don't know you're taking them, or you're not expecting green poop. Nullo tablets cause stomach cramps in some people, but work so well, on everything from bad breath, to body odor, to poop smell, that deer hunters use them to avoid being detected by deer. There's a new (at least to me) product called Odor Cleanse, that's made from mushrooms.