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P21: 5 mg vial with 3 mL water
Quick answer
Adding 3 mL of bacteriostatic water to a 5 mg P21 vial gives 1.67 mg/mL (1666.7 mcg/mL), so each unit on a U-100 insulin syringe holds 16.7 mcg. A 50 mcg dose is 3 units (0.03 mL), and the vial holds about 100 doses of that size.
Concentration
- Vial: 5 mg P21
- Bacteriostatic water: 3 mL
- Concentration: 1.67 mg/mL (1666.7 mcg/mL)
- 1 unit on a U-100 syringe = 16.7 mcg
P21 dose to syringe units
| Dose | Syringe units (U-100) | Volume | Doses per vial |
|---|---|---|---|
| 2 mcg (protocol dose) | 0.1 units, too small to measure reliably | 0.001 mL | 2500 |
| 5 mcg (protocol dose) | 0.3 units, too small to measure reliably | 0.003 mL | 1000 |
| 50 mcg | 3 units | 0.03 mL | 100 |
| 100 mcg | 6 units | 0.06 mL | 50 |
| 200 mcg | 12 units | 0.12 mL | 25 |
| 250 mcg | 15 units | 0.15 mL | 20 |
| 300 mcg | 18 units | 0.18 mL | 16 |
| 500 mcg | 30 units | 0.3 mL | 10 |
Units on a U-100 insulin syringe (100 units = 1 mL).
Common questions
How many units is 50 mcg of P21 from a 5 mg vial with 3 mL water?
50 mcg is 3 units (0.03 mL) on a U-100 insulin syringe. With 3 mL of water in a 5 mg vial, each unit holds 16.7 mcg. For comparison: 100 mcg = 6 units, 200 mcg = 12 units, 250 mcg = 15 units.
What is the concentration of a 5 mg P21 vial mixed with 3 mL of water?
5 mg divided by 3 mL is 1.67 mg/mL, or 1666.7 mcg per mL. On a U-100 syringe (100 units = 1 mL) that is 16.7 mcg per unit.
How many 50 mcg doses are in a 5 mg vial?
About 100. The water volume changes how many units each dose takes, not how many doses the vial holds.
How much water should I add to a 5 mg P21 vial?
The Crestigen P21 protocol uses 2 mL. 3 mL works too as long as you calculate units for this concentration (1.67 mg/mL) and label the vial.
Other P21 vial and water combinations
- 5 mg vial + 1 mL water
- 5 mg vial + 2 mL water
- 5 mg vial + 3 mL water
Open this in the dosage calculator · Full P21 protocol, reconstitution and storage