The Syringe Confusion Problem
Peptide doses are often written in micrograms (mcg) or milligrams (mg) — but insulin syringes are marked in Units. This guide connects those scales.
Key Conversion: 1 mg = 1,000 mcg
Work in micrograms when calculating small doses. A 5 mg vial contains 5,000 mcg.
U-100 Syringe Explained
A U-100 syringe holds 1.0 mL = 100 Units. Each Unit mark equals 0.01 mL.
Calculating Your Syringe Draw
Once you know concentration (mg/mL or mcg/mL), divide your dose by concentration to get mL, then multiply by 100 for U-100 units.
Example: 5 mg vial + 2 mL BAC water → 2.5 mg/mL. A 250 mcg (0.25 mg) dose → 0.10 mL → 10 Units.
Quick Reference
| Syringe | Capacity | 1 Unit = |
|---|---|---|
| U-100 | 1.0 mL | 0.01 mL |
| U-50 | 0.5 mL | 0.01 mL |
| U-30 | 0.3 mL | 0.01 mL |
Educational and research framing only. Not medical advice.