Daily leave-on serum, formulated with hyaluronic acid, offers intense hydration to soothe dry scalps and support long term hair hydration..A hydrated scalp is a key component to maintaining a healthy + strong barrier to prevent scalp concerns before they develop.Multi-Molecular Hyaluronic Acid delivers hydration to various layers of the scalp + hair shaft, while Amino Acids help lock in moisture and strengthen the scalp barrier.By maintaining moisture within the hair shaft, this can create the appearance of fuller hair.30ml.On a clean damp or dry scalp, apply 3-4 pipettes. Massage into scalp evenly. Leave on and do not rinse.