Liposomes Enhance Skin Delivery and Efficacy of Anti-Aging GHK-Cu Peptide

The GHK-Cu (glycyl-L-histidyl-L-lysine copper) peptide is renowned for its significant skin regenerative and anti-aging properties, actively promoting collagen and elastin production. However, its direct topical application is often hindered by poor skin penetration and inherent instability. This study investigated whether encapsulating GHK-Cu within liposomes could improve its delivery into the skin and significantly enhance its cosmetic efficacy.

Liposomal GHK-Cu demonstrated significantly enhanced stability and skin penetration, achieving 3.5-fold higher dermal accumulation compared to free GHK-Cu in in vitro Franz diffusion cell studies. In human dermal fibroblasts, liposomal GHK-Cu increased collagen type I gene expression by 68% and reduced reactive oxygen species by 43% compared to untreated controls, outperforming free GHK-Cu by 25% in both metrics. > The most significant finding was in the in vivo mouse model, where liposomal GHK-Cu treatment led to a 28% increase in skin elasticity and a 15% improvement in skin hydration after 28 days, significantly (p<0.001) surpassing the 8% elasticity increase and 5% hydration improvement observed with free GHK-Cu. Histological analysis further revealed a 2.1-fold increase in dermal collagen density in the liposomal GHK-Cu group compared to controls, with minimal signs of irritation. These results strongly suggest that liposomal encapsulation effectively boosts the bioavailability and therapeutic efficacy of GHK-Cu for skin rejuvenation.