Good Chemistry's most-concentrated formulation, the Eau de Parfum is a timeless staple that can be used for any and all occasions. Good Chemistry's most-concentrated formulation, the Eau de Parfum is a timeless staple that can be used for any and all occasions. There’s a science to positive vibes, and we’re here for it – with affordably fun fragrances, cruelty-free formulas and the know-how to create a positive reaction (from your nose to your toes). That’s Good Chemistry.