Kérastase’s newest innovation – the Spécifique Divalent Collection – is a dual-action routine with amino acids and ceramides for combating an oily scalp and hydrating dry ends. It launches this month.   This trio of personal care products is rooted in the skinification of hair, featuring a balancing shampoo, intensive, weekly clay cleanser and a rehydrating mask that absorbs oil while invigorating the scalp and leaving hair soft, shiny and volumized, according to the company. It also recently ...