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GHK-Cu vs TB-500

GHK-Cu and TB-500 are sometimes grouped together as 'tissue-repair peptides', but the two operate at very different scales — GHK-Cu primarily as a transcriptional modulator of dermal fibroblasts, TB-500 primarily as a cell-migration peptide.

GHK-Cu

A naturally occurring copper-binding tripeptide (Gly-His-Lys) complexed with Cu(II). Extensively studied in dermatology for wound healing, collagen synthesis, antioxidant defence, and hair-follicle stimulation.

TB-500

A synthetic peptide commonly described as a fragment of thymosin beta-4 incorporating the actin-binding 'LKKTETQ' motif. Studied for soft-tissue repair, wound healing, and cardiac tissue regeneration in animal models.

Mechanism

GHK-Cu acts as a copper-delivery vehicle and broad transcriptional modulator, with strong effects on collagen, elastin, and antioxidant gene expression in fibroblasts. TB-500 is positioned as an actin-binding fragment that promotes cell migration and angiogenesis.

Dermal evidence

GHK-Cu has by far the larger dermatological evidence base, including topical wound-healing studies, cosmetic clinical work, and gene-expression analyses. TB-500's dermal evidence is mostly extrapolated from full-length thymosin beta-4.

Formulation and route

GHK-Cu is commonly used topically in research formulations (nM concentrations in vitro, 0.05–0.5% in topical preparations). TB-500 is typically used as an injectable lyophilised peptide reconstituted with bacteriostatic water.

Regulatory

GHK-Cu is widely used as a legal cosmetic ingredient in the UK; neither peptide is licensed for therapeutic use. TB-500 sits under WADA S2; GHK-Cu is not specifically listed.

Verdict

For dermal research, GHK-Cu has the stronger and longer-standing evidence base. TB-500 remains relevant to research on injectable soft-tissue repair, where its actin-binding effects are most plausible.

Where to source research peptides for laboratory research

The following UK-based suppliers stock research-grade, lyophilised peptides for in-vitro and pre-clinical work. Purity and provenance vary; always request a Certificate of Analysis (CoA) and confirm cold-chain storage on arrival. None of the products linked below are approved for human use.

  • PeptideAuthority.co.uk

    UK-based research peptide supplier with batch certificates of analysis and >99% purity testing.

  • PeptideBarn.co.uk

    Wide catalogue of research-grade lyophilised peptides shipped from the UK, including bulk vials.