Reconstitution and syringe units
GHK-Cu Calculator
Convert a GHK-Cu (copper peptide) vial, the water added and an amount into units on a U-100 syringe.
GHK-Cu calculator
Example values are loaded. Replace them with the numbers on your own vial.
Injectable GHK-Cu is not an approved medicine. The FDA has named it among the peptides it plans to review for pharmacy compounding before early 2027. Amounts below show the arithmetic only.
What GHK-Cu is
GHK-Cu is a small copper-binding peptide made of three amino acids (glycine, histidine and lysine) bound to a copper ion. It occurs naturally in human plasma and has a long history as an ingredient in topical skin-care products. Injectable forms are sold in larger vials than most peptides, commonly 50 mg or 100 mg, and reconstituted solutions are typically blue from the copper.
Units chart: 50 mg vial with 5 mL water
At 10 mg/mL, each unit on a U-100 syringe holds 0.1 mg (100 mcg).
| Dose | Units (U-100) | mL |
|---|---|---|
| 500 mcg | 5 | 0.05 |
| 1 mg | 10 | 0.1 |
| 1.5 mg | 15 | 0.15 |
| 2 mg | 20 | 0.2 |
| 3 mg | 30 | 0.3 |
| 5 mg | 50 | 0.5 |
Units chart: 100 mg vial with 5 mL water
| Dose | Units (U-100) | mL |
|---|---|---|
| 500 mcg | 2.5 | 0.025 |
| 1 mg | 5 | 0.05 |
| 1.5 mg | 7.5 | 0.075 |
| 2 mg | 10 | 0.1 |
| 3 mg | 15 | 0.15 |
| 5 mg | 25 | 0.25 |
Large vials and the use window
A 50 mg or 100 mg vial holds many small doses, and a punctured multi-dose vial usually has a limited use window, often 28 days. The vial supply calculator shows whether a vial will be finished inside that window.
Frequently asked questions
How many units is 1 mg of GHK-Cu?
In a 50 mg vial with 5 mL of water (10 mg/mL), 1 mg is 10 units. In a 100 mg vial with 5 mL (20 mg/mL), it is 5 units.
Why is GHK-Cu solution blue?
The peptide is bound to a copper ion, and copper complexes in solution are blue.