head hair heal soothing serumFormat: 50 Ml 1. 7 Oz A soothing scalp serum that hydrates and treats dry, itchy, or flaky scalps. Apply to damp or dry scalp whenever it needs a boost of calm. Instructions for use Apply the formula using the dropper to damp or dry scalp and leave on. As this is a leave in product, there is no need to rinse. The Soothing Serum can be applied morning, evening, or throughout the day whenever your scalp needs relief.