Scalp Care 90ml treatment serum specifically designed to prevent hair loss. I used this during the postpartum hair loss phase, but I'm selling it now that things have settled down. For those who want to try it before purchasing at a salon, or for those who have difficulty purchasing it at a salon, please consider this. - Brand: Kérastase - Product Name: Leave-in Treatment - Volume: 60-70% remaining of 90ml - How to Use: Can be used daily - Effects: Prevents hair loss, strengthens hair Apply about 5 drops to the scalp with the dropper. Do not rinse. Massage into the scalp with your fingertips.