This patented bioactive peptide treatment strengthens and improves elasticity while repairing damage caused by chemical treatments, thermal styling and mechanical styling. Suitable for all hair types. This leave-in mask heals and strengthens hair with lightweight moisturizing properties to detangle and keep hair smooth and soft without weighing it down. For best results, use the first 4-6 consecutive washes after a treatment and then every 3-4 washes as needed to maintain hair strength. The K18 mask was not formulated to act like a normal conditioner. Although some find that it provides sufficient softening and smoothing properties, others may prefer enhanced conditioning benefits by adding a leave-in conditioner after the four-minute processing time. On the days you do not use the K18 mask, use your regular shower or leave-in conditioner as usual. When heat styling, use a heat protectant after four minutes of processing time. You can also add additional styling products on top of the mask if needed. K18Peptide™ is the miracle molecule hair care has been waiting for. Clinically proven to reverse damage in just 4 minutes.