"If you don't know what's in a product, you can't make an informed choice on if you want to buy it."
L'Oréal, Mac, Cover Girl, Clinique and Nars were all brands tested in the new research.
The 18-year-old says she wouldn't leave the house without a tan.
You probably already have this product in your cupboard.
Pollution isn't just an issue on the urban streets, it's probably impacting you inside your own home.
The creators said the idea may sound nuts, but it has a serious message.
Researchers found Emma Lewisham's moisturiser outshone some cult faves by at least 70 percent.
"This made me cry! Passport photos are the worst."
I tried the treatment that's been gaining popularity, even though it dates back 2000 years.