Kerastase's Nutritive Magistral is the latest update from the Nutra Thermique family. Providing optimal hydration for brittle, damaged hair, the formula behind Magistral contains nutrients that supplies strands with immunity from dryness. So say bye to dry. The line includes a shampoo, conditioner, masque and a leave in balm. Whether hair is damaged from round-the-clock photoshoots and set lighting, constant coloring or the love-hate relationship you have with your flat iron,