Hexyl cinnamal is an ingredient used in many perfumes and is often seen in perfumed skin care products. Hexyl cinnamal gives a jasmine-like scent. It's considered a skin sensitizer, which is why it has to be called out on an ingredient statement, whereas previously a cosmetics company could lump ingredients like hexyl cinnamal into the umbrella term "fragrance." https://www.paulaschoice.com/ingredient-dictionary/ingredient-hexyl-cinnamal.html?q=Hexyl%20Cinnamal&fdid=ingredients