The Ordinary DensityMulti-Peptide Serum for Hair Density 60ml Retail $23. Batch Code 3D1B new in Box 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. This formula contains REDENSYL™, Procapil™, CAPIXYL™, BAICAPIL™, AnaGain™, and High-Solubility Caffeine.