Refresh and revitalise the scalp while supporting fuller, youthful-looking hair with Nioxin Pro Clinical Age Defense Leave-In Scalp Serum. The lightweight, leave-on formula helps care for roots while improving the appearance of early greying, thinning hair and reduced density. Enriched with black oat peptides, niacinamide and caffeine, it supports natural melanin production to help delay the appearance of early greys, promote longer-lasting natural colour and encourage visible fullness. Safe for colour-treated hair and free from sulphates, the serum also helps maintain moisture and smoothness.