Healthy, beautiful-looking hair starts at the scalp. The Post-Biotic Calming Conditioner is a cooling rinse-out conditioner super-charged with Hyaluronic Acid, a post-biotic known as a moisturising miracle in the skincare world. Just 1 gram of it can hold up to 6 liters of water, making it the ultimate hydrating ingredient both for the scalp and the hair.