they are called nullo. they are said to control more than breath odor, but also affect your body's smell overall. i have used them. you're supposed to start taking them about 4 days before you go hunting. drink plenty of water ok, or they may constipate you a bit. and don't be alarmed when your poop turns a little green. i have no idea if they work or not, but have had success while using them on the ground. had a group of deer at about 10 ft. also from a stand at about 15 ft horizontal distance without being sniffed. plenty of people have had this experience in blue jeans and sneakers with no scent control at all though. if its just breath control your after eat raw parsley.