What it is: Shampoo with zinc PCA for normal to thin hair gently cleanse to remove impurities such as follicle-clogging seburn from the scalp. What it does: Contains ceramide to strengthen hair and SP-94 to nourish the scalp, promoting a healthy scalp environment and improving the appearance of thinning hair. What else you need to know: The Cerafill Defy System makes hair looks visibly fuller with added shine.