Use this GHK-Cu dosage calculator for a 100 mg or 50 mg vial: it turns vial strength, BAC water volume, and target dose into a precise draw in mL and syringe units. GHK-Cu is also formulated for topical use, but this page focuses on the math for liquid reconstitution.
- Common vial examples
- 50 / 100 mg
- Example dose
- 2 mg
- Common syringe
- U-100 insulin
- Last reviewed
Quick math example
A 100 mg vial mixed with 5 mL gives 20 mg/mL. A 2 mg dose is 0.1 mL, which equals 10 units on a U-100 syringe. The same 2 mg from a 50 mg vial in 5 mL (10 mg/mL) is 0.2 mL, or 20 units.
GHK-Cu reconstitution reference
U-100 units to draw for each common GHK-Cu dose, by vial size, reconstituted with 5 mL of bacteriostatic water. Change the water volume in the calculator above to recompute for your own setup.
| Vial | Concentration | 1 mg | 2 mg |
|---|---|---|---|
| 50 mg | 10 mg/mL | 10 u(0.1 mL) | 20 u(0.2 mL) |
| 100 mg | 20 mg/mL | 5 u(0.05 mL) | 10 u(0.1 mL) |
Swipe the table to see every dose →
Educational reference only — not a dose recommendation. Units assume a U-100 insulin syringe (100 units = 1 mL on U-100). Always confirm against your own vial, diluent, and clinician or pharmacy instructions.
How the GHK-Cu calculation works
GHK-Cu is labelled in milligrams per vial. Concentration is the total mg divided by BAC water volume, and per-dose volume is your target divided by that concentration.
Larger vials are common for GHK-Cu because of its broader use in cosmetic and topical formulations; the calculator math handles the higher mg amounts the same way.
- 50 mg vial = 50,000 mcg total
- 50,000 mcg / 5 mL = 10,000 mcg per mL
- 2,000 mcg target = 0.2 mL draw
GHK-Cu 100 mg vial with 5 mL example
A 100 mg vial mixed with 5 mL gives 20 mg/mL, or 20,000 mcg/mL — double the strength of the 50 mg example below.
At this concentration a 2 mg dose is only 0.1 mL (10 units) and a 1 mg dose is 0.05 mL (5 units). A stronger vial keeps draws small even for larger doses; if 5-unit draws feel too tight to read, use 10 mL of water instead (10 mg/mL) so the same 1 mg dose becomes 10 units.
- 100 mg / 5 mL = 20 mg/mL
- 2,000 mcg / 20,000 mcg per mL = 0.1 mL = 10 U-100 units
- 100 mg / 10 mL = 10 mg/mL → 2 mg = 0.2 mL = 20 units
GHK-Cu 100 mg vial: units per dose (5 mL BAC water)
U-100 units to draw for each common GHK-Cu dose, by vial size, reconstituted with 5 mL of bacteriostatic water. Change the water volume in the calculator above to recompute for your own setup.
| Vial | Concentration | 1 mg | 2 mg |
|---|---|---|---|
| 100 mg | 20 mg/mL | 5 u(0.05 mL) | 10 u(0.1 mL) |
Swipe the table to see every dose →
Educational reference only — not a dose recommendation. Units assume a U-100 insulin syringe (100 units = 1 mL on U-100). Always confirm against your own vial, diluent, and clinician or pharmacy instructions.
GHK-Cu 50 mg vial with 5 mL example
A 50 mg GHK-Cu vial mixed with 5 mL gives 10 mg/mL, or 10,000 mcg/mL.
A 2 mg (2,000 mcg) dose is 0.2 mL, which equals 20 units on a U-100 syringe. A 1 mg dose would be 0.1 mL (10 units).
- 50 mg / 5 mL = 10 mg/mL
- 2,000 mcg / 10,000 mcg per mL = 0.2 mL = 20 U-100 units
- 1,000 mcg / 10,000 mcg per mL = 0.1 mL = 10 U-100 units
GHK-Cu 50 mg vial: units per dose (5 mL BAC water)
U-100 units to draw for each common GHK-Cu dose, by vial size, reconstituted with 5 mL of bacteriostatic water. Change the water volume in the calculator above to recompute for your own setup.
| Vial | Concentration | 1 mg | 2 mg |
|---|---|---|---|
| 50 mg | 10 mg/mL | 10 u(0.1 mL) | 20 u(0.2 mL) |
Swipe the table to see every dose →
Educational reference only — not a dose recommendation. Units assume a U-100 insulin syringe (100 units = 1 mL on U-100). Always confirm against your own vial, diluent, and clinician or pharmacy instructions.
How much BAC water for a 50 mg GHK-Cu vial
There is no single correct volume; the water sets the concentration and the concentration sets how many units each dose takes. For a 50 mg vial, 5 mL (10 mg/mL) is the most common choice because it puts a 1 mg dose exactly on the 10-unit line and a 2 mg dose on 20 units.
Use 2.5 mL (20 mg/mL) if you want smaller draws, or 10 mL (5 mg/mL) if you prefer larger, easier-to-read draws and have a vial big enough to hold it. Whatever you choose, enter it in the calculator above so the units match your actual vial.
- 50 mg / 2.5 mL = 20 mg/mL → 1 mg = 5 units, 2 mg = 10 units
- 50 mg / 5 mL = 10 mg/mL → 1 mg = 10 units, 2 mg = 20 units
- 50 mg / 10 mL = 5 mg/mL → 1 mg = 20 units, 2 mg = 40 units
Topical vs injectable framing
Topical GHK-Cu products are typically pre-formulated and do not require this math. The calculator is intended for situations where you are reconstituting a lyophilized vial yourself, and it reports mg/mL concentration rather than the percentage strength used on cosmetic labels.
Frequently asked questions
Is GHK-Cu approved as a medicine?
How do I handle a 100 mg GHK-Cu vial?
Can the calculator tell me how to use GHK-Cu topically?
Why are GHK-Cu vials often larger than other peptides?
How many units is 2 mg of GHK-Cu from a 100 mg vial?
Primary sources
Background references for this calculator. PepSync does not make clinical claims; these citations support the educational context only.