The Ordinary Multi-Peptide Serum for Hair Density is a concentrated leave-in formula that is designed to support the scalp and give you thicker, denser, fuller-looking hair. It is a lightweight serum that is not greasy, but it can leave your fingers tacky after applying it to your scalp. The serum contains essential peptides such as CAPIXYL and Procapil, which help to prevent hair loss while stimulating hair growth. Here are some insights from user and expert. BRAND NEW NEVER OPENED.