What's in it? Cinnamal

Other names it goes by Cinnamaldehyde, Cinnamic Aldehyde, Cinnamyl Aldehyde, 2-Propenal, 3-Phenyl.

What's it used in? Fragrances, body washes, soaps, moisturisers.

What does it do? A fragrance added to cosmetics that smells particularly of jasmine.

Any controversy? On the list of EU banned and restricted fragrances because it's toxic to the human immune system. The US, however, has not banned its use.