Grapefruit Peel Extract Worst Irritant No known benefits Grapefruit Peel Extract description Typically listed as _Citrus paradisi_ (grapefruit) peel extract on ingredient lists, the peel from this fruit is loaded with a class of ingredients known as furanocoumarins and coumarins, which are primarily responsible for what’s known as a phototoxic reaction that occurs when skin is exposed to the sun. Low amounts of this ingredients aren’t likely to be problematic, but watch out if it’s listed toward the beginning to middle of an ingredient list, especially if the product in question has a telltale grapefruit scent. Related ingredients: Coumarin Grapefruit Oil