5-free, 10-free, etc. refers to nail polish formulated without harsh ingredients. This terminolgy is ever evolving. Our products are formulated without the following common ingredients, however, please view our full ingredients list to see if our nail polishes are free of the other chemicals that are marketed as 20-free, 50-free, etc: Our nail polish does not contain: Formaldehyde, Toluene, DBP, Camphor, Xylene, Parabens, Ethyl Tosylamide, Fragrance, Phthalates, and Animal Ingredients Ingredients List