What's in it? Octoxynol-9

Also known as: nonaethylene glycol octylphenyl ether, peg-9 octyl phenyl ether, polyethylene glycol 450 octyl phenyl ether, polyoxyethylene (9) octyl phenyl ether

What's it used in? Shampoos, conditioners, moisturisers, exfoliants, styling products, whitening products and hair colourants

What does it do? It's used as a cleansing or emulsifying agent.

Any controversy? A Japanese report shows limited evidence of endocrine disruption.