What's in it? Xanthan gum

Other names it goes by Corn sugar gum, xanthan, polysaccharide B 1459.

What's it used in? Moisturisers, products with a gel texture, toothpaste.

What does it do? Xanthan gum acts as a stabiliser and a skin hydrator.

Any controversy? It's considered low-hazard, mainly because there have been no major studies on it. The FDA is seeking new toxicology information.