Want to make your nighttime hair-care routine feel a little more luxurious? Kérastase Nutritive 8H Magic Night Serum is an overnight leave-in hair treatment designed for dry hair. The product listing highlights nourishment, enhanced shine, and frizz reduction. The bottle shown in the Amazon listing is the 90 ml (3.04 fl oz) size. If you are exploring overnight hair treatments, here are a few things to know about this product and how it may fit into your routine. What Is Kérastase Nutritive 8H Magic Night Serum? This leave-in serum is designed to be used as part of an overnight hair-care routine. Overnight treatments are convenient for people who prefer applying a hair product before bed rather than adding extra steps to their morning routine. The product is marketed for dry hair and is intended to help improve the appearance and feel of hair by morning. How to Add It to Your Nighttime Hair Routine 1. Start with the Product Directions Read the label to check the recommended amount and w...