GHK-Cu 50 mg reconstitution calculator
How much bac water for GHK-Cu 50 mg?
There’s no single right amount: the water sets the strength, not how much GHK-Cu is in the vial, so use the volume on your pharmacy’s instructions. For example, 2 mL makes 25 mg/mL and 2.5 mL makes 20 mg/mL; the table below shows what each volume means on a U-100 syringe.
Your GHK-Cu vial
Syringe
1 mL · 2-unit marks
Work backwards
Find the water for a given reading in units.
Enter your numbers to see the result.
Enter your numbers
This is arithmetic, not medical advice. Confirm with your prescriber or pharmacist.
How our calculator worksAdvanced
Vial capacityOptional
The volume printed on the vial or its box, not the mg. We’ll tell you if the water won’t fit.
What each volume makes
| Water | Strength | Each unit | 1 mg is |
|---|---|---|---|
| 2 mL | 25 mg/mL | 250 mcg | 4 units |
| 2.5 mL | 20 mg/mL | 200 mcg | 5 units |
| 5 mL | 10 mg/mL | 100 mcg | 10 units |
Examples; use the volume on your pharmacy’s instructions. Units are on a U-100 syringe: 100 units = 1 mL.
5 mL needs a vial that holds at least that much. Check the size printed on your vial, in mL, before adding water (how much water a vial can hold).
About the 50 mg vial
A 50 mg vial makes a strong solution
50 mg is five times what a 10 mg vial holds, so every unit carries more. With the example volumes, each unit on a U-100 syringe holds 250 mcg with 2 mL (25 mg/mL), 200 mcg with 2.5 mL (20 mg/mL) and 100 mcg with 5 mL (10 mg/mL). At 25 mg/mL, a reading that’s off by one unit moves 250 mcg, so small misreadings count for more than in a smaller vial. More water makes each unit hold less, but 5 mL only fits a vial that holds at least that much, and the 50 mg on the label doesn’t tell you the vial’s capacity. Enter the volume you were told to use above, and the calculator shows the units for the amount you were prescribed.
Sold as a cosmetic, not approved as an injection
GHK-Cu is mostly sold as a cosmetic ingredient. Cosmetics don’t need FDA approval, but a product intended to affect the structure or any function of the body is a drug under the law, and its intended use decides which one it is (FDA). No GHK-Cu drug is FDA-approved. In the FDA’s compounding lists, GHK-Cu sits in Category 1 only “except for injectable routes of administration” (FDA). The injectable nominations were withdrawn, and the FDA says compounded injectable GHK-Cu “may pose risk for immunogenicity due to the potential for aggregation and peptide-related impurities,” with limited data in humans (FDA). So no official label sets a water volume for a vial like this one.
The 50 mg doesn't tell you about the copper
GHK-Cu is a copper complex, and how the copper is bound can differ from one product to the next. A 2026 review says the research “frequently treats GHK-Cu as a single active ingredient despite formulation-dependent variation in coordination state, speciation, stability, pharmacokinetics, and toxicity,” and that whether a product releases intact GHK-Cu or free copper is usually not resolved (Pharmaceutics, 2026). A 2025 review describes GHK peptides as hydrophilic and unstable, which makes them hard to formulate (Bioimpacts, 2025). The calculator treats the 50 mg on your label as one number; it can’t tell you what form that 50 mg is in.
If your label lists more than one peptide
If your label lists more than one peptide, the mg on the front may be the total for all of them. This page works with one number for the whole vial, so its figures would be for the mix, not for GHK-Cu alone. Enter each peptide’s mg from your label in the blend calculator to see how much of each one a unit holds.
Sources for these notes
- Is It a Cosmetic, a Drug, or Both? (Or Is It Soap?)U.S. Food and Drug Administration (opens in a new tab)
- Bulk Drug Substances Nominated for Use in Compounding Under Section 503A of the FD&C Act (updated May 14, 2026)U.S. Food and Drug Administration, 2026 (opens in a new tab)
- Certain Bulk Drug Substances for Use in Compounding that May Present Significant Safety RisksU.S. Food and Drug Administration, 2026 (opens in a new tab)
- GHK-Cu as a Bioactive Metallopeptide and Drug-Delivery Cargo: Coordination Chemistry, Formulation Science, Therapeutic Evidence, and a Translational RoadmapPharmaceutics, 2026 (opens in a new tab)
- Topically applied GHK as an anti-wrinkle peptide: Advantages, problems and prospectiveBioimpacts, 2025 (opens in a new tab)
About GHK-Cu
US regulatory status
Cosmetic ingredient (topical)
GHK-Cu is sold mainly in cosmetics, which don’t need FDA approval, and no GHK-Cu drug is FDA-approved. Injectable GHK-Cu is not on any list that allows pharmacy compounding, and the FDA has flagged it for possible immune reactions. Non-injectable GHK-Cu was put back in Category 1 in May 2026, ahead of an FDA advisory committee review planned before the end of February 2027.
As of
Sources (4)
- Is It a Cosmetic, a Drug, or Both? (Or Is It Soap?)U.S. Food and Drug Administration (opens in a new tab)
- Bulk Drug Substances Nominated for Use in Compounding Under Section 503A of the FD&C Act (updated May 14, 2026)U.S. Food and Drug Administration, 2026 (opens in a new tab)
- Certain Bulk Drug Substances for Use in Compounding that May Present Significant Safety RisksU.S. Food and Drug Administration, 2026 (opens in a new tab)
- Meeting of the Pharmacy Compounding Advisory Committee (to be held before the end of February 2027)U.S. Food and Drug Administration, 2026 (opens in a new tab)
How this GHK-Cu calculator works
This GHK-Cu reconstitution calculator starts from the 50 mg in your vial. Add the water you mix it with and the dose your prescriber gave you; it divides the mg by the mL to get the strength, then turns your dose into mL and units on a 30, 50 or 100-unit syringe.
Peptinote never suggests a dose or a water volume. The example volumes are there to make the math easy to check, not as advice. For the full method, see the peptide calculator.
Questions people ask
How much bacteriostatic water do I add to 50mg of GHK Cu?
There’s no single right amount: use the volume on your pharmacy’s instructions. The water only sets the strength; the vial still holds 50 mg however much you add. With 2 mL it’s 25 mg/mL (250 mcg per unit), with 2.5 mL 20 mg/mL (200 mcg per unit) and with 5 mL 10 mg/mL (100 mcg per unit). Enter your volume and prescribed dose above to get the units.
How much bac water goes into 50mg of GHK Cu?
Whatever volume you add, only the strength changes; the vial still holds 50 mg. More water spreads it out, so each unit holds less and the same dose takes more units: easier to measure, but more liquid to inject. Going from 2 mL to 5 mL takes each unit from 250 mcg to 100 mcg. Check the volume on your pharmacy’s instructions first.
How much bacteriostatic water to mix with 50 mg of GHK-Cu?
Use the volume your pharmacy specifies, and never more than the vial itself can hold (its size in mL, not the 50 mg on the label). If you weren’t given a volume, ask the pharmacist who dispensed the vial before mixing. For reference, the bac water calculator shows the arithmetic: water (mL) = vial mg × units ÷ (dose mg × 100).
How does GHK-Cu 50 mg reconstitution work?
Wipe both stoppers with alcohol and let them dry. Draw the volume of bacteriostatic water your pharmacy specifies into a new syringe, add it slowly down the inside of the vial, then swirl gently until clear; don’t shake. Label it with the strength: 50 mg in 2 mL is 25 mg/mL. Full steps: how to reconstitute peptides.
How do I reconstitute GHK-Cu 50 mg?
Mixing your GHK-Cu 50 mg vial takes the bacteriostatic water your pharmacy specifies and a new sterile syringe. Add the water slowly against the glass and swirl, never shake, until the liquid is clear. If it stays cloudy or has particles, don’t use it; call your pharmacy. Then write the strength and date on the vial and store it as the label says (how to store peptides).
Is there a GHK-Cu reconstitution calculator?
This page is the GHK-Cu 50 mg reconstitution calculator. Enter the water you add (or tap an example volume) and your prescribed dose, and it shows the units to draw on a 30, 50 or 100-unit syringe, the strength, and the doses in the vial, with every step of the math. It never suggests a dose.
Can Peptinote tell me how many units to take?
No. Peptinote never suggests a dose. Enter the dose your prescriber gave you, and the calculator shows how to measure it: the units, the mL and where the line sits on your syringe, with every step of the math. If you aren’t sure what your dose is, ask your prescriber or pharmacist before drawing anything. How our calculator works.
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Every result is plain arithmetic from formulas we publish in full and check with automated tests. Peptinote doesn’t suggest doses and never sells or links to sellers of peptides.