GHK-Cu: Reference Overview and Reconstitution Notes

GHK-Cu

What it is

GHK-Cu is a chelated complex of the human tripeptide glycyl-L-histidyl-L-lysine (GHK) bound to a copper(II) ion. It belongs to the copper-peptide family, and the GHK sequence occurs naturally in human blood plasma, from which it was first isolated.

Research context and categorization

GHK-Cu is generally grouped under the healing and tissue-repair category, with heavy overlap into the skin and cosmetic and the anti-aging and longevity categories. In neutral research terms, it is commonly discussed in relation to collagen and extracellular-matrix biochemistry, copper coordination chemistry, and dermal-fibroblast biology. It has been investigated in the context of wound-healing and tissue-remodeling models, antioxidant and anti-inflammatory pathways, and gene-expression modulation, and it appears in cosmetic-science literature that studies skin firmness and the appearance of wrinkles.

Much of the published GHK-Cu literature consists of in-vitro and animal-model work, together with some small, short-duration human cosmetic studies. These uses are investigational. GHK-Cu is not FDA-approved for these applications, and the outcomes discussed in the literature are not confirmed or approved benefits. The descriptions here state what the compound is studied or discussed in relation to, not established effects.

Status

  • Regulatory status: Research-only / not FDA-approved for any injectable indication. Topical GHK-Cu is used as a cosmetic ingredient (an OTC cosmetic ingredient does not require FDA approval), but injectable and systemic use is not FDA-approved and is treated as investigational. As of 2026 its compounding status has been under active FDA and advisory-committee review, so the regulatory picture may continue to change.
  • Sport status: Not specifically listed on the WADA Prohibited List by name. Athletes should note that WADA maintains broad catch-all categories (for example, growth factors and substances that affect tissue regeneration under class S2, peptide hormones, growth factors, related substances and mimetics), which some analysts consider could plausibly capture a compound like GHK-Cu. Anyone subject to anti-doping testing should confirm current status with their governing body or a qualified anti-doping advisor.

Reconstitution notes (general)

For lyophilized (freeze-dried) peptides supplied as a powder, concentration equals the milligrams in the vial divided by the millilitres of bacteriostatic water added. For example, a 50 mg vial reconstituted with 2 mL of bacteriostatic water gives 25 mg/mL, and the same 50 mg vial with 5 mL gives 10 mg/mL. To work out any combination, use the calculator at our reconstitution and blend calculators.

Dilution and handling notes (compound-specific)

GHK-Cu ships as a lyophilized powder that is reconstituted before use. Several points are specific to this compound:

  • Color is meaningful. The intact copper-peptide complex is blue to blue-teal (the copper ion absorbs visible light near 600 nm), so the dry powder is blue and a correctly reconstituted solution shows a faint blue to blue-green tint that deepens with concentration. A solution that has gone clear, pale, or brown-green has lost copper coordination and is no longer GHK-Cu in the form described in the research literature.
  • It generally dissolves readily. The powder typically goes into solution within a few minutes of gentle swirling. Peptides are fragile, so protocols describe a slow rotating swirl rather than shaking, and directing the added water down the inner glass wall rather than straight onto the powder.
  • Concentration figures seen in research references vary widely, from roughly 2 mg/mL up to about 33 mg/mL, chosen mainly so that measured volumes are convenient rather than because of any single "correct" strength.
  • It can precipitate at elevated pH. GHK-Cu is somewhat prone to copper precipitation and cloudiness if the solution drifts alkaline, and more concentrated solutions are more likely to fall out of solution over time. Bacteriostatic water (mildly acidic, with roughly 0.9 percent benzyl alcohol as preservative) is generally preferred both for its preservative property and because a mildly acidic environment is more favorable to copper coordination stability. Cloudiness, particles remaining after several minutes of swirling, or an off odor indicate degradation.

Handling and storage

Refrigerate the reconstituted solution at 2 to 8 degrees Celsius, kept out of direct light. Wipe the vial stopper with an alcohol swab before each access, and label the vial with the mix date. Treat roughly a 4-week refrigerated window as a practical guideline for a reconstituted vial. Do not freeze a reconstituted solution, since ice-crystal formation can damage the peptide. Discard if the solution becomes cloudy, discolored, loses its blue tint, or shows floaters.

Related reading

Tools and supplies

For laboratory and research reference only. Educational content, not medical, dosing, injection, or therapeutic guidance, and not intended for human or animal use. Any research uses described are investigational and not confirmed or approved benefits. Confirm anything involving health with a licensed professional. References linked above.