New Methods Developed to Track Anti-Aging GHK-Cu Peptide Skin Absorption

GHK-Cu is a potent anti-aging tripeptide renowned for its ability to promote collagen synthesis, enhance skin regeneration, and reduce inflammation. However, its therapeutic potential in topical applications is often hampered by poor skin penetration due to its molecular size and hydrophilic nature. This study addresses the critical need for robust and sensitive analytical methods to accurately quantify the permeation of GHK-Cu, especially when delivered via advanced systems like liposomes, into the deeper layers of the skin.

The developed analytical method demonstrated exceptional sensitivity, capable of detecting GHK-Cu at concentrations as low as 0.5 ng/mL in complex biological matrices, with a high linearity (R² > 0.999). Crucially, the method achieved a remarkable 95% recovery rate for GHK-Cu from spiked skin tissue samples, confirming its reliability for accurate quantification. > Liposomal encapsulation of GHK-Cu significantly enhanced its skin permeation, resulting in a 2.8-fold increase in cumulative peptide delivery into the receptor fluid over 24 hours compared to the free peptide solution. Specifically, the liposomal formulation delivered an average of 185 ng/cm² of GHK-Cu into the dermis, whereas the free peptide delivered only 66 ng/cm² under identical conditions (p<0.001). This enhanced delivery was attributed to the liposomes' ability to overcome the stratum corneum barrier, with a 43% reduction in transepidermal water loss observed in liposome-treated skin compared to controls.