Acetyl Hexapeptide 38

Acetyl Hexapeptide-38 (marketed as Adifyline®) is a synthetic hexapeptide designed to address volume loss and deep structural wrinkles associated with subcutaneous fat atrophy in aged skin. Unlike surface-acting anti-wrinkle peptides, Acetyl Hexapeptide-38 targets dermal fibroblasts and pre-adipocytes in the hypodermis, stimulating both collagen synthesis in the dermis and differentiation of pre-adipocytes into mature subcutaneous adipocytes. This dual anabolic action simultaneously rebuilds structural collagen scaffold and restores the cushioning subcutaneous fat layer that thins with chronological aging and photodamage. The N-terminal acetylation of the hexapeptide (Ac-Ser-Val-Val-Val-Arg-Thr-NH2) enhances proteolytic stability and cell membrane permeability relative to the free peptide. In vitro studies demonstrate that Acetyl Hexapeptide-38 significantly upregulates adipogenic markers including PPAR-γ, C/EBPα, and adiponectin in pre-adipocyte cultures, confirming activation of the adipogenic differentiation program. Simultaneously, fibroblast cultures treated with this peptide show increased collagen Type I and IV production and improved ECM organization. Applications in skin research focus on facial volume restoration, deep wrinkle reduction (particularly nasolabial folds and marionette lines), and reversal of facial lipoatrophy. Clinical in vivo studies report measurable improvements in cheek volume and skin fullness with consistent topical application, positioning Acetyl Hexapeptide-38 as a non-invasive alternative to dermal fillers for volumetric skin research.