There are hundreds of chemicals in beauty products--some of which are bad for you and bad for the environment.
The Environmental Working Group created a cosmetics database where you can search by product, ingredient or company. They rank products on a scale of 0-10 (where 10 is the most hazardous). My Opi nail polish scores OK-it gets a 4, making it safer than most. My fancy Dior mascara is not so good. The group gives it an 8.