has its odor due to allyl methyl sulfide, allyl methyl disulfide, allyl mercaptan, diallyl disulfide, dimethyl disulfide and methyl mercaptan, along with minor amounts of dimethyl selenide
in particular, allyl methyl sulfide (AMS) does not break down quickly and remains in the body in significant amounts hours after consumption, resulting in an odour that can last for up to two days