FOR decades, companies that make everything from after-shave to lip gloss have conducted safety testing on grooming products and shipped the cosmetics to stores to be sold to consumers, all with very little government involvement. And over the years, there have been few health or safety problems associated with the myriad grooming products and cosmetics on the market. Nonetheless, momentum has been building for greater oversight of the chemicals in everyday products, with the European Union and California taking the lead in imposing new rules for monitoring what is in the perfumes, creams, nail polish and hair sprays that are...