The rhute Density + Repair scalp serum is dermatologist-developed for hair growth. Built on HairScience, designed to work where healthy hair actually begins: your scalp. It's a barrier-boosting scalp serum with a dual-action approach, supporting hair growth while repairing and strengthening your scalp's delicate skin barrier. The lightweight, oil-free formula delivers active ingredients directly to your follicles. Caffeine and bioactive peptides help reduce shedding and encourage stronger growth, stem cell extracts support follicle regeneration, and niacinamide soothes, balances, and protects your scalp barrier. It absorbs quickly with no residue, so it works quietly in the background of your day.