The final step in NIOXIN’s 3-Part Scalp Recovery™ Anti-Dandruff System Kit, the Soothing Serum is a leave-on formula ideal for hair types prone to dandruff.The serum is infused with dermatologist-tested ingredients, including green tea extract and pyrithione zinc, working to gently cleanse and clarify your scalp. Applied after cleansing and conditioning hair for optimal results, the serum is suitable for use on all hair types.