Improve the appearance of thinning hair with the redken cerafill defy thickening shampoo for normal to thin hair this gentle cleansing shampoo is enriched with zinc pca which will remove impurities and sebum from the scalp and help to promote a healthy scalp environment the perfect re boot for thinning hair the restorative shampoo will help to nourish and thicken hair follicles whilst intensely cleansing the head and hair after use hair will feel fuller and healthier hair fibres will be