Just when dry shampoo seemed like the holy grail of non-hair-washing, an independent lab has found that at least 34 different brands contained “quantifiable” amounts of benzene, a chemical that can cause cancer. The New Haven-based Valisure found that in 70% of the 148 samples they tested, benzene levels were 170 times higher than the FDA-approval level, which is two parts per million, or two milligrams per liter of a liquid.
