Reconstitution chart: 50 mg vial
| BAC water added | Concentration | Draw for 1 mg dose | Draw for 2 mg dose |
|---|---|---|---|
| 1 mL | 50,000 mcg/mL | 2 units | 4 units |
| 1.5 mL | 33,333 mcg/mL | 3 units | 6 units |
| 2 mL | 25,000 mcg/mL | 4 units | 8 units |
| 2.5 mL | 20,000 mcg/mL | 5 units | 10 units |
Draws are U-100 insulin syringe units (100 units = 1 mL). Formula: dose in mcg ÷ (vial mcg ÷ water mL) × 100. The calculator above handles any other combination.
About GHK-Cu
GHK-Cu is a copper-binding tripeptide that occurs naturally in human plasma, saliva, and urine, with levels that decline steeply with age. Most of its research history is in skin care, where it appears in topical cosmetic products. Injectable use sits firmly in research territory with no regulatory approval. The solution has a distinctive blue color from the bound copper; that color is normal and expected.
The practical challenge with GHK-Cu is proportions. Vials commonly hold 50 or 100 mg, far larger than other peptides, while discussed doses run 1 to 3 mg. Dissolve a 50 mg vial in 1 mL of water and a 1 mg dose is a 2 unit draw, too small to measure with any confidence on an insulin syringe. This is the textbook case for adding more water: at 2.5 mL the same dose becomes a 5 unit draw.
If you work with a 100 mg vial, consider that one vial at 2 mg per dose holds fifty doses, which raises a storage question more than a math question. Reconstituted peptide degrades over time even refrigerated, so a smaller vial size or splitting the powder may serve you better than heroic water volumes. The calculator flags any draw under 3 units so you never have to eyeball a sliver of a syringe.
Quick facts
- Status: no approval for injectable use; widely used topically in cosmetics
- Naturally occurring copper tripeptide; the blue color is normal
- Commonly discussed doses: 1 to 3 mg; vials commonly 50 or 100 mg
- Watch for tiny draws: large vials need more water for readable doses