GHK-Cu

Topical GHK-Cu (typically 1-3% in serums or creams) is the most common form for skin and hair applications. Injectable subcutaneous forms are researched for systemic effects including wound healing, tissue repair, and scalp injection for hair density. Both routes have published preclinical support.

Approximately 2-3 hours in plasma after parenteral administration. Topically, the molecule is cleared as the skin barrier metabolizes and turns over the upper epidermal layers, with effects on gene expression measurable for days after application.

Topical: 1-3% in formulation, applied 1-2x daily. Injectable: 1-3mg subcutaneous daily or every other day, often near area of interest. Scalp microneedling/injection protocols use 2-3mg diluted across the treatment area weekly.

Yes — topically, GHK-Cu is often layered with Matrixyl (palmitoyl pentapeptide-4) for complementary collagen stimulation. Systemically it pairs well with BPC-157 and TB-500 for tissue repair research. Avoid combining with strong vitamin C in the same topical layer (can disrupt copper coordination).

Bacteriostatic water is the standard diluent for injectable forms. For a 50mg vial, 5mL of BAC water yields 10mg/mL. Swirl gently — the solution should appear blue from the copper ion. Refrigerate and protect from prolonged light. Reconstituted product is typically stable for 30+ days.

Generally well-tolerated topically and via SC injection. Caution in subjects with copper sensitivity or Wilson's disease. Localized irritation or transient blue-green discoloration at application site is possible at higher concentrations. No systemic toxicity reported at research doses.