GHK-Cu calculator
GHK-Cu is a copper-binding tripeptide found in blood and studied mostly in skin, where topical creams at 0.5 to 2% have real human data. The injectable form sold as a research peptide has none; the 1 to 2 mg a day under the skin that users report comes from forums, not trials.
- Frequency
- once daily (some every other day)
- Timing
- any time; evening is common because of injection site stinging
- Cycle
- 4 to 8 weeks on, 2 to 4 weeks off
- Route
- subcutaneous, abdomen; topical cream or serum for skin
- Easy mix
- 50 mg + 2.5 mL = 20 mg/mL, so 1 mg = 0.05 mL = 5 units; 2 mg = 10 units. A 100 mg vial with 5 mL gives the same 20 mg/mL. The solution turns blue because of the copper.
GHK-Cu units chart
50 mg vial. Rows are doses; columns show the units to draw on a U-100 syringe at each water volume.
| Dose | mL | U-100 units | Doses per vial |
|---|---|---|---|
| 100 mcg | 0.005 | 0.5 | 500 |
| 200 mcg | 0.01 | 1 | 250 |
| 250 mcg | 0.013 | 1.3 | 200 |
| 500 mcg | 0.025 | 2.5 | 100 |
| 1 mg | 0.05 | 5 | 50 |
| 2 mg | 0.1 | 10 | 25 |
| 2.5 mg | 0.13 | 12.5 | 20 |
| 5 mg | 0.25 | 25 | 10 |
| 10 mg | 0.5 | 50 | 5 |
Other mixes: 50 mg + 1 mL · 50 mg + 2 mL · 50 mg + 3 mL · 100 mg + 2 mL
About the GHK-Cu math
GHK-Cu is a tripeptide, glycine-histidine-lysine, bound to a copper ion. Research catalogs carry it as a lyophilized powder in 50 mg and 100 mg vials, and the same material appears in many cosmetic formulations. The masses are ten times larger than a 5 mg peptide vial, so the solvent volumes that give clean numbers are larger too. A 50 mg vial with 5 mL of bacteriostatic water is 10 mg/mL, or 10,000 mcg/mL. A 1 mg draw is then 0.1 mL, or 10 units on a U-100 syringe, and the vial holds 50 of them. A 100 mg vial with the same 5 mL is 20 mg/mL, so 1 mg is 0.05 mL, or 5 units, and the vial holds 100 draws. Put only 2 mL in a 50 mg vial and the concentration climbs to 25 mg/mL, where 1 mg is 0.04 mL, or 4 units. Check the vial capacity before adding 5 mL or more; many 3 mL vials will not take it.
GHK-Cu questions
How much GHK-Cu should I inject?
There is no established injectable human dose. The commonly reported range is 1 to 2 mg under the skin once a day for 4 to 8 weeks. On a 50 mg vial in 2.5 mL that is 5 to 10 units.
How do you reconstitute 50 mg of GHK-Cu?
Add 2.5 mL of bacteriostatic water for 20 mg/mL, then 1 mg is 5 units. With 2 mL you get 25 mg/mL and 1 mg is 4 units, which is hard to measure. The solution will be blue; that is the copper, not contamination.
How many units is 1 mg of GHK-Cu at 50 mg in 5 mL?
50 mg divided by 5 mL is 10 mg/mL. 1 mg divided by 10 mg/mL is 0.1 mL. On a U-100 syringe that is 10 units, and the vial holds 50 such draws.
How much bacteriostatic water for a 100 mg vial of GHK-Cu?
Any volume the vial holds. 1 mL gives 100 mg/mL, 2 mL gives 50 mg/mL and 3 mL gives 33.3 mg/mL (rounded). At 50 mg/mL a 2 mg draw is 0.04 mL, or 4 units, which is small to read; a larger volume spreads the same mass across more units.
How many 2 mg draws are in a 50 mg vial of GHK-Cu?
50 divided by 2 is 25 draws. With 5 mL of solvent (10 mg/mL) each draw is 0.2 mL, or 20 units; with 2.5 mL (20 mg/mL) each draw is 0.1 mL, or 10 units.
Brands we recommend for GHK-Cu. We are independent and have no affiliation with any brand: no affiliate links, no referral codes, no paid placements. These are the suppliers whose testing and certificates hold up when we check them.
- Licensed Peptides two accredited labs on every lot, certificates public, card and Apple Pay checkout
- Core Peptides long track record, public certificates, wide catalog
- Ascension Peptides public third-party testing, clear pricing