GHRP-2 peptide calculator
A 5 mg GHRP-2 vial mixed with 2 ml of bacteriostatic water holds 2.5 mg/ml. A 100 mcg dose is 0.040 ml — 4 units on a U-100 insulin syringe — and the vial holds 50 doses of that size.
GHRP-2 dosage chart: units to draw
Units on a U-100 insulin syringe (100 units = 1 ml) for GHRP-2 doses from 50 mcg to 300 mcg, by how much bacteriostatic water is in a 5 mg vial. The highlighted row is the 100 mcg dose used above.
| Dose | 1 ml water 5 mg/ml | 2 ml water 2.5 mg/ml | 3 ml water 1.67 mg/ml | Doses per vial |
|---|---|---|---|---|
| 50 mcg | 1 u 0.010 ml | 2 u 0.020 ml | 3 u 0.030 ml | 100 |
| 100 mcg | 2 u 0.020 ml | 4 u 0.040 ml | 6 u 0.060 ml | 50 |
| 150 mcg | 3 u 0.030 ml | 6 u 0.060 ml | 9 u 0.090 ml | 33 |
| 200 mcg | 4 u 0.040 ml | 8 u 0.080 ml | 12 u 0.12 ml | 25 |
| 300 mcg | 6 u 0.060 ml | 12 u 0.12 ml | 18 u 0.18 ml | 16 |
A 4-unit draw is hard to measure accurately — each tick on a U-100 syringe is 1 or 2 units. Mixing the same vial with 4 ml of water makes the same 100 mcg dose 8 units, which is easier to read. A 0.3 ml insulin syringe (30-unit capacity) with half-unit marks also helps.
Unit math only, not a dosing recommendation. The dose range is what published protocols and trials describe; see the GHRP-2 guide for sources.
How to reconstitute GHRP-2
- Wipe both vial stoppers with a fresh alcohol swab and let them dry.
- Draw 2 ml of bacteriostatic water into a syringe.
- Insert the needle at an angle into the GHRP-2 vial and let the water run slowly down the inner wall — do not inject directly onto the powder.
- Do not shake. Gently swirl the vial until the peptide fully dissolves.
- Storage for GHRP-2: Lyophilized refrigerated. Reconstituted: refrigerated, use within 28 days. At one 100 mcg dose a day the vial holds 50 doses, more than a 28-day window allows.
- For a 100 mcg dose, draw to the 4-unit mark (0.040 ml) on a U-100 insulin syringe.
About GHRP-2
GHRP-2 is a synthetic ghrelin receptor agonist that strongly stimulates growth hormone release. It is often paired with a GHRH analog to amplify GH pulses.
Half-life: Approximately 15–60 minutes
Typical dose range: 100–300 mcg per injection, up to 3x daily
Class: Ghrelin-mimetic growth hormone secretagogue
Regulatory status: Not FDA approved for therapeutic use. Used as a diagnostic agent for GH deficiency in some countries. Research use only in the US.
Read the full GHRP-2 guide → — mechanism, side effects, storage, regulatory status and citations. Or browse the whole peptide glossary.
Other tools for GHRP-2
Calculators for related peptides: GHRP-6, Sermorelin, CJC-1295, Hexarelin, HGH (Somatropin).
Need a different unit or a different question? The peptide dose converter moves a dose between mcg, mg and IU, and the GHRP-2 half-life chart shows how concentration accumulates across a dosing cadence. Loading GHRP-2 into a reusable 3 ml pen instead of drawing it with a syringe? The peptide pen calculator turns the same vial into mcg per click and clicks to dial. All of them are listed on the free peptide tools page.
GHRP-2 calculator FAQ
Is this a GHRP-2 peptide calculator or a reconstitution calculator?
Both. This GHRP-2 calculator converts vial strength, bacteriostatic-water volume, and target dose into milliliters and insulin-syringe units. It does not recommend a medical dose.
How much bacteriostatic water for a 5 mg GHRP-2 vial?
This page is pre-filled with 2 ml of bacteriostatic water for a 5 mg GHRP-2 vial because that is a common research ratio. You can adjust the water amount in the full calculator.
How many units is a 100 mcg GHRP-2 dose?
4 units on a U-100 insulin syringe, when a 5 mg vial is mixed with 2 ml of bacteriostatic water (2.5 mg/ml). That is 0.040 ml. With a different amount of water the unit count changes — the dose chart on this page lists 1 ml, 2 ml, 3 ml mixes.
How many doses are in a 5 mg GHRP-2 vial?
50 doses of 100 mcg. The number of doses depends only on vial strength and dose size — adding more or less water changes the volume of each draw, not how many draws the vial holds.
Does this GHRP-2 dosage calculator give medical advice?
No. It only performs unit math. Dosing, titration, and whether GHRP-2 is appropriate are clinical decisions that should be made with a licensed healthcare professional.
Skip the math — let the app handle it
Peptide Protocol remembers your GHRP-2 vial, shows the units for every dose, tracks what is left, and rotates injection sites for you.
Get the iPhone app →Educational use only. Peptide Protocol is an informational tool. Nothing on this page constitutes medical advice. Many peptides are prescription-only or restricted in your jurisdiction. Always consult a licensed healthcare professional before injecting any compound.