Keratin Rich Treatment Deeply restore over-processed hair with the 12Reasons Keratin Hair Treatment Mask 250ml – Formulated with Hydrolysed Keratin and Macadamia Oil, this hair mask repairs dry, damaged hair. The result? Soft, shiny, manageable hair.   How to use:   Apply a generous amount to shampooed, damp hair. Leave in for 5-10 minutes. Rinse.  Hot Tip: Results are optimised when combined with 12Reasons Keratin Shampoo and Conditioner.