How to Reconstitute GHK-Cu: Step-by-Step Guide (2026)
GHK-Cu reconstitution guide: 2mL BAC water into a 50mg vial = 4 units per 1mg dose. Covers subq prep, storage, and common mistakes.
How to Reconstitute GHK-Cu
GHK-Cu (copper peptide) arrives as a lyophilized powder and needs to be mixed with bacteriostatic water before injection. The process is identical to reconstituting any peptide, with one notable difference — GHK-Cu turns a faint blue-green color when dissolved. That's the copper ion, and it's completely normal.
This guide covers the full reconstitution process for subcutaneous injection. GHK-Cu is also used topically for skin and hair applications, but the mixing and dosing math here focuses on injectable preparation.
What You Need
Before you start, gather everything:
- GHK-Cu lyophilized vial (typically 50mg, 100mg, or 200mg)
- Bacteriostatic water (BAC water) — not sterile water, not saline
- Insulin syringes — 1mL (100 unit), 29-31 gauge
- Alcohol swabs — for cleaning vial tops
- A clean, flat workspace
Why bacteriostatic water? It contains 0.9% benzyl alcohol that prevents bacteria from growing in your solution. Regular sterile water has no preservative, so the vial must be used within 24 hours. BAC water gives you up to 28 days refrigerated.
Step-by-Step Reconstitution
Step 1: Clean Everything
Wipe the tops of both vials (GHK-Cu and BAC water) with alcohol swabs. Let them air dry for 10 seconds. This prevents contamination — skip it at your own risk.
Step 2: Draw Your Bacteriostatic Water
Using a fresh insulin syringe, draw your desired amount of BAC water. The amount you add determines your concentration (see the dilution charts below).
For most people, 2mL is the sweet spot. It gives manageable injection volumes for standard doses.
Step 3: Add Water to the Peptide Vial
Insert the needle into the GHK-Cu vial at an angle, aiming at the glass wall — not directly at the powder. Let the water trickle down the side of the vial gently.
Do not squirt water directly onto the powder. Peptides are fragile. Aggressive mixing can damage the molecular structure and reduce potency.
Step 4: Let It Dissolve
Gently swirl the vial with a slow rotating motion. Do not shake it. The powder should dissolve within 1-3 minutes into a clear solution with a faint blue-green tint. This color is normal — it comes from the copper ion bound to the GHK peptide.
If the solution is cloudy or has visible particles after 5 minutes of gentle swirling, the peptide may be degraded. Discard it.
Step 5: Store Correctly
Refrigerate immediately at 36-46F (2-8C). The reconstituted solution is stable for up to 28 days with bacteriostatic water.
Dilution Charts
50mg Vial
| BAC Water Added | Concentration | 1mg Dose | 2mg Dose |
|---|---|---|---|
| 1mL | 50mg/mL | 2 units (0.02mL) | 4 units (0.04mL) |
| 2mLRecommended | 25mg/mL | 4 units (0.04mL) | 8 units (0.08mL) |
| 2.5mL | 20mg/mL | 5 units (0.05mL) | 10 units (0.1mL) |
100mg Vial
| BAC Water Added | Concentration | 1mg Dose | 2mg Dose |
|---|---|---|---|
| 1mL | 100mg/mL | 1 unit (0.01mL) | 2 units (0.02mL) |
| 2mLRecommended | 50mg/mL | 2 units (0.02mL) | 4 units (0.04mL) |
| 4mL | 25mg/mL | 4 units (0.04mL) | 8 units (0.08mL) |
200mg Vial
| BAC Water Added | Concentration | 1mg Dose | 2mg Dose |
|---|---|---|---|
| 2mLRecommended | 100mg/mL | 1 unit (0.01mL) | 2 units (0.02mL) |
| 4mL | 50mg/mL | 2 units (0.02mL) | 4 units (0.04mL) |
| 5mL | 40mg/mL | 2.5 units (0.025mL) | 5 units (0.05mL) |
Why 2mL? It keeps injection volumes small enough for subcutaneous delivery while remaining measurable on an insulin syringe.
The Math (So You Can Do It Yourself)
Here's the formula for any vial size and any amount of water:
Concentration = Peptide Amount (mg) / Water Added (mL)
Then to find your injection volume:
Units to inject = Desired Dose (mg) / Concentration (mg/mL) x 100
Example: 100mg vial + 2mL water = 50mg/mL. For a 2mg dose: 2 / 50 x 100 = 4 units.
Don't want to do math? Use our Reconstitution Calculator — plug in your vial size, water amount, and desired dose, and it does the rest.
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Common Mistakes
Shaking the Vial
Peptides are proteins. Shaking creates foam, which means air bubbles trapped against peptide molecules. This can denature (destroy) the peptide at the air-liquid interface. Always swirl gently. The copper complex in GHK-Cu is relatively stable, but there's no reason to stress it.
Using Too Little Water
Adding 0.5mL to a 100mg vial gives you 200mg/mL. A 1mg dose would be 0.5 units — effectively impossible to measure accurately on any insulin syringe. Use at least 1mL, ideally 2mL.
Leaving It at Room Temperature
Reconstituted GHK-Cu degrades at room temperature. Every hour on the counter reduces potency. Pull the vial out, draw your dose, put it back. The copper complex does not make it more shelf-stable once in solution.
Reusing Needles
Each puncture through the rubber stopper dulls the needle and increases contamination risk. Fresh syringe every time — they cost pennies.
Freezing Reconstituted Peptide
Freezing a liquid peptide solution creates ice crystals that can shear the peptide bonds apart. Only freeze lyophilized (powder) peptides. Once reconstituted, refrigerate — never freeze.
How Many Doses Per Vial?
This depends on your dose and vial size:
50mg vial at 1mg/dose = 50 doses 50mg vial at 2mg/dose = 25 doses 100mg vial at 1mg/dose = 100 doses 100mg vial at 2mg/dose = 50 doses 200mg vial at 2mg/dose = 100 doses
At a standard protocol of 1-2mg daily, a 50mg vial lasts 25-50 days. A 100mg vial can last months at lower doses — just remember the 28-day limit once reconstituted with BAC water. For larger vials, consider reconstituting only what you'll use within 4 weeks.
Storage Quick Reference
| State | Temperature | Shelf Life |
|---|---|---|
| Lyophilized (powder) | Room temp | 6-12 months |
| Lyophilized (powder) | Refrigerated | 2+ years |
| Lyophilized (powder) | Frozen (-20C) | 3+ years |
| Reconstituted (BAC water) | Refrigerated | Up to 28 days |
| Reconstituted (sterile water) | Refrigerated | Use within 24 hours |
Pro tip: If you buy larger vials (100mg or 200mg), consider splitting the reconstituted solution into smaller sterile vials to minimize stopper punctures. Or simply purchase multiple smaller vials and only reconstitute what you'll use within 3-4 weeks.
Related Reading
- GHK-Cu Bloodwork Guide — what labs to track and optimal ranges
- GHK-Cu Dosing Guide — protocols, injection sites, and cycling
- BPC-157 Reconstitution Guide — another regenerative peptide, similar mixing process
- TB-500 Dosing Guide — often combined with tissue repair peptides
- Ipamorelin Reconstitution Guide — growth hormone peptide mixing guide
- CJC-1295 Reconstitution Guide — GHRH analog mixing and timing
References
- Pickart, L., et al. (2012). The human tripeptide GHK-Cu in prevention of oxidative stress and degenerative conditions of aging: implications for cognitive health. Oxidative Medicine and Cellular Longevity, 2012, 324832. PMC3359723
- Pickart, L., et al. (2015). GHK peptide as a natural modulator of multiple cellular pathways in skin regeneration. BioMed Research International, 2015, 648108. PMC4508379
- Pickart, L., et al. (2018). Regenerative and protective actions of the GHK-Cu peptide in the light of the new gene data. International Journal of Molecular Sciences, 19(7), 1987. PMC6073405
- Pickart, L. (2008). The human tri-peptide GHK and tissue remodeling. Journal of Biomaterials Science, Polymer Edition, 19(8), 969-988.
- USP General Chapter 797: Pharmaceutical Compounding — Sterile Preparations. Storage and beyond-use dating guidelines for reconstituted peptides.
This guide is for educational and informational purposes only. It is not medical advice. GHK-Cu is sold as a research compound and is not FDA-approved for human use. Reconstituting and self-administering peptides carries inherent risks including infection, contamination, and dosing errors. Always use proper sterile technique. Consult a qualified healthcare provider before starting any peptide protocol. The Peptide Catalog is not responsible for any adverse effects resulting from the use or misuse of information presented here.