Mixing & measuring
The arithmetic,
made simple
Peptides ship as a freeze-dried powder. You decide the strength by how much water you add.
Strength5 mg/mL
Each unit holds50 mcg
Draw to5 units
Arithmetic only, not dosing advice. Double-check against the syringe in your hand.
Step by step
- Let the vial reach room temperature. Wipe both stoppers with alcohol.
- Draw bacteriostatic water and run it slowly down the glass, not onto the powder.
- Swirl or roll gently. Never shake. Shaking can damage the peptide.
- The solution should be clear. If it's cloudy or has particles, discard it.
- Label the vial with the date and concentration, then refrigerate.
The only formula you need
mg in vial ÷ mL of water = mg per mL
On a U-100 syringe, 1 unit = 0.01 mL, so mcg per unit = (mg per mL) × 10. Example: 10 mg + 2 mL = 5 mg/mL = 50 mcg per unit, so 250 mcg = 5 units.
Storage & handling
| State | Where | Rule of thumb |
|---|---|---|
| Powder, long term | Freezer, −20 °C | Dry, dark and sealed. Months to years for most peptides. |
| Powder, short term | Fridge, 2–8 °C | Weeks. Brief room-temperature transit is fine. |
| Mixed | Fridge, 2–8 °C | Usually around 4 weeks with bacteriostatic water. Never freeze it again. |
Keep every state away from light. Copper peptides such as GHK-Cu are naturally blue, which is normal. Cloudiness that appears later is not.