Kérastase Nutri-supplement Scalp Serum is a moisturizing serum for dry scalp. This is our ultimate scalp treatment: a niacinamide-based serum that delivers vitamins to dry scalp to deeply nourish dry hair and scalp. Thanks to its quickly absorbed milky texture, it becomes the best serum for dry scalp. How to use: Apply 2 to 4 pipettes to dry or damp scalp depending on hair thickness. Massage to distribute evenly. Dry with a dryer or air. Do not clarify. Use as many times as necessary