Quick math example
A 50 mg vial mixed with 5 mL gives 10 mg/mL. A 2 mg dose is 0.2 mL, which equals 20 units on a U-100 syringe.
GHK-Cu 100 mg vial reference
U100 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) |
Educational reference only — not a dose recommendation. Units assume a U100 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 100 mg GHK-Cu vial
A 100 mg vial is twice as concentrated as a 50 mg vial in the same water, so doses come out at very small volumes unless you add more diluent. Many people use 3–5 mL to keep the injection volume and the syringe reading practical.
5 mL gives 20 mg/mL, so a 2 mg dose is only 0.1 mL (10 units). If that draw feels too small to measure accurately, use more water — 10 mL brings it back to 10 mg/mL and a 20-unit draw.
- 100 mg / 3 mL = 33.3 mg/mL → 2 mg = 0.06 mL = 6 units
- 100 mg / 5 mL = 20 mg/mL → 2 mg = 0.10 mL = 10 units
- 100 mg / 10 mL = 10 mg/mL → 2 mg = 0.20 mL = 20 units
Why 100 mg GHK-Cu draws are so small
The higher the vial strength, the less liquid carries each milligram of peptide. That is convenient for total injection volume but unforgiving on measurement: at 20 mg/mL, the difference between 1 mg and 2 mg is just 5 units, so a small syringe misread is a large percentage error.
If precision matters more than injection volume to you, err toward more bacteriostatic water. Spreading 100 mg across 10 mL doubles every draw and makes each unit line represent a smaller dose, which is easier to hit consistently.
- Stronger vial = smaller draw = less measurement margin
- More BAC water trades a bigger injection for easier accuracy
- 1 mg vs 2 mg at 20 mg/mL is only 5 units apart — measure carefully
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 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 100 mg vial with 5 mL example
A larger 100 mg vial mixed with 5 mL gives 20 mg/mL, or 20,000 mcg/mL — double the strength of the 50 mg example.
At this concentration a 2 mg dose is only 0.1 mL (10 units). A stronger vial keeps draws small even for larger doses.
- 100 mg / 5 mL = 20 mg/mL
- 2,000 mcg / 20,000 mcg per mL = 0.1 mL = 10 U-100 units
- A stronger vial keeps the same dose at a smaller volume
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.