GHK vs Thymosin Alpha-1

Cosmetic

Immune

Research Only

Research Only

GHK is a high-affinity ligand for copper(II), forming the GHK-Cu complex that mediates most of its documented biology. Via the copper-bound form, GHK is proposed to modulate expression of a large number of human genes (microarray and Broad Institute Connectivity Map analyses from Pickart's group), including pathways related to extracellular matrix remodeling, antioxidant response element induction, angiogenesis, and DNA repair. Reported in vitro and preclinical effects include stimulation of fibroblast collagen and glycosaminoglycan synthesis and acceleration of wound healing. The bare (non-copper) peptide is typically weaker than GHK-Cu in these assays and is generally assumed to acquire copper in serum-containing environments.

Tα1 acts primarily on dendritic cells and T-cells via Toll-like receptor signaling — TLR9-MyD88-IRF7 driving type I interferon, and TLR2-MyD88-NF-κB driving IL-12, TNF-α, and IL-6. It promotes dendritic cell maturation, T-cell differentiation and thymic output, enhances NK cell cytotoxicity, upregulates MHC class I expression, and induces indoleamine 2,3-dioxygenase (IDO) to balance inflammation with tolerance. Unlike broad cytokine stimulators, Tα1 is a context-dependent immunomodulator that can enhance deficient responses and restrain overactive ones.

50–200 ppm topical (~0.005–0.02%)

1.6 mg