Multi-Peptide Serum for Hair Density is a concentrated leave-in formula designed to support the scalp and give you thicker, denser, fuller-looking hair. The formula is lightweight and offers a combination of peptide technologies alongside a series of plant-based extracts. Note: The technologies found within this formula include REDENSYL, Procapil, CAPIXYL, BAICAPIL, AnaGain, and High-Solubility Caffeine.