Dosage guide · 5 mg vial

GHRP-2 Dosage Protocol

Growth hormone-releasing peptide-2 · ghrelin-receptor agonist

The reference protocol uses GHRP-2 once daily: 100 mcg for weeks 1–2, 150 mcg for weeks 3–4, then 200 mcg from week 5. With 3 mL bacteriostatic water, a 5 mg vial is 1.67 mg/mL, so the 100 mcg start amount is 6 units (0.06 mL) on a U-100 syringe.

How oftenOnce daily

Starting dose100 mcg

Start = units6 units

Mix3 mL BAC water

Reviewed 25 Oct 2026 · Education only, not medical advice

GHRP-2 5 mg vial

Not currently stocked by Peak Peptides Australia

No product photo — this strength isn't stocked by Peak

Dosage chart How to mix Supplies Calculator About GHRP-2 References

01 · DOSAGE CHART

GHRP-2 dosage chart

Gradual daily approach · 5 mg vial + 3 mL BAC water

BAC water added

Concentration1.67 mg/mL

1 unit (U-100)16.7 mcg= 0.01 mL

How oftenOnce dailySubcutaneous injection

3 mL is the mix specified by the 5 mg reference protocol, giving 1.67 mg/mL and 6 units for 100 mcg.

GHRP-2 dosage chart for a 5 mg vial mixed with 3 mL of bacteriostatic water
Week	Daily dose	Syringe units
Weeks 1–2Start	100 mcg	6 units0.06 mL
Weeks 3–4	150 mcg	9 units0.09 mL
Weeks 5–8	200 mcg	12 units0.12 mL
Weeks 9–12	200 mcg	12 units0.12 mL
Weeks 13–16Maintenance	200 mcg	12 units0.12 mL

Once daily · any consistent time · subcutaneous injection

The reference protocol steps up every 2 weeks from 100 to 150 to 200 mcg once daily.

It keeps the 200 mcg daily amount through week 16; its listed protocol length is 8–16 weeks.

Reference-site educational amounts — GHRP-2 has no clinically established Australian dose and the TGA ARTG search returned no matching product. Education only, not medical advice. Dose amounts adapted from GHRP-2 5 mg vial dosage protocol (PeptideDosages.com); units are recalculated for the vial and mix selected above.

02 · HOW TO MIX

Mixing a 5 mg vial with 3 mL of BAC water

Using a 1 mL (100-unit) insulin syringe, 3 full draws of bacteriostatic water gives 1.67 mg/mL.

1
Add the water slowly
Wipe both rubber stoppers with an alcohol swab and let them dry. Draw 3 mL of bacteriostatic water and let it run slowly down the inside of the vial wall — not straight onto the powder.
2
Swirl gently
Swirl or roll the vial gently until the powder has dissolved. Give it a few minutes to settle if needed.
3
Don't shake it
Shaking can damage the peptide and cause foaming. Gentle swirling only.
4
Check it's fully clear
Only use it once it is fully clear with no particles. Label the vial with the date and 1.67 mg/mL, then store it in the fridge at 2–8 °C.

Full illustrated reconstitution guide

03 · SUPPLIES NEEDED

What you'll need

Counts follow the dosage chart above at the highest amount in each step, using a 5 mg vial mixed with 3 mL.

Length of protocol

2GHRP-2 5 mg vials9.1 mg needed in total

581 mL insulin syringesU-100, 27–31G · one per draw + one per vial mixed

1BAC water 10 mL bottle6 mL used for mixing

116Alcohol swabsSkin + stopper, every time

Plus an approved sharps container. Syringes and swabs are sold by Australian pharmacies — Peak Peptides and Pure Performance supply the bacteriostatic water.

Peak Peptides Australia Bacteriostatic water 10 mL

Bacteriostatic water 10 mLPeak Peptides Australia

Pure Performance Australia Bacteriostatic water 10 mL

Bacteriostatic water 10 mLPure Performance Australia

04 · CALCULATOR

Check a different amount

Enter your vial, water and dose to see the matching syringe units.

Concentration Calculator

Labelled Vial Amount (mg)

Verified Final Liquid Volume3 mL

Amount to Evaluate (not a recommendation)

mcg

Concentration

1.67 mg/mL

(1667 mcg/mL)

Calculated Liquid Volume

0.060 mL

Equivalent U-100 volume scale position

6markings (not biological IU)

Illustration of a U-100 volume scale, not preparation or injection guidance

05 · PROTOCOL DETAILS

About GHRP-2

Protocol overview

Starting dose: 100 mcg once daily for weeks 1–2
How it increases: 150 mcg for weeks 3–4, then 200 mcg through week 16
Frequency: Once daily by subcutaneous injection
When to take it: Any consistent time; the reference protocol notes evening administration
Cycle length: 8–16 weeks in the reference protocol
Common mix: 3 mL bacteriostatic water → 1.67 mg/mL

Storage

Before mixing: Keep the dry vial protected from heat and light, and follow the exact product label's storage and expiry instructions.
After mixing: Refrigerate at 2–8 °C and protect from light; follow the product-specific use-by instructions.
Never: Do not use a mixed vial if it is cloudy or has particles in it.

How it works

GHRP-2, also called pralmorelin, is a synthetic six-amino-acid peptide that acts as an agonist at the ghrelin or growth-hormone-secretagogue receptor.

Human studies show that it can trigger a short-lived rise in pituitary growth hormone. It can also affect other pituitary-adrenal hormones, including ACTH, cortisol and prolactin, so it is not selective for growth hormone alone.

Illustrated mechanism explainer

What the research shows

In a clinical study of 6 prepubertal children with growth-hormone deficiency, subcutaneous GHRP-2 at 0.3, 1.0 and 3.0 mcg/kg/day in successive 2-month periods produced dosewise increases in overnight growth-hormone secretion; IGF-1 and IGFBP-3 did not increase.
In 9 healthy subjects given 100 mcg subcutaneously each day for 5 days, mean peak growth hormone declined from 83 on day 1 to 51 microg/L on day 5, indicating significant response attenuation; mean IGF-1 did not rise.
In an acute study, 6 young adults and 6 older adults received 1 or 2 mcg/kg intravenously. GHRP-2 caused a dose-related growth-hormone response and also increased prolactin, ACTH and cortisol.
In 7 lean healthy men, a 270-minute subcutaneous infusion at 1 mcg/kg/hour increased buffet-meal energy intake by 35.9% compared with saline and increased growth-hormone exposure.
The TGA ARTG search returned no matching GHRP-2 product. TGA scheduling material lists pralmorelin or GHRP-2 in Schedule 4 and Appendix D.
FDA places injectable and nasal GHRP-2 in its category of bulk substances that may present significant safety risks; this is not an approval or a dosing standard.

Reported side effects

GHRP-2 is not selective for growth hormone: a human study found increases in ACTH, cortisol and prolactin after intravenous doses of 1 and 2 mcg/kg.
Appetite can increase. In 7 healthy men, food intake was 35.9% higher during a 270-minute GHRP-2 infusion than during saline.
After 5 daily 100 mcg subcutaneous doses in 9 healthy people, the growth-hormone response fell significantly over the 5 days, while average IGF-1 did not increase.
FDA identifies potential immunogenicity from peptide aggregation or impurities in compounded injectable or nasal GHRP-2, and notes reports of infection, pancreatitis, increased insulin requirement, and deaths in critically ill subjects; causality was not established.

Important notes

A TGA ARTG search for GHRP-2 returned no matching product. TGA scheduling material identifies pralmorelin or GHRP-2 as a Schedule 4 substance and includes it in Appendix D.
Prohibited in sport at all times: WADA lists GHRP-2 or pralmorelin among GH-releasing peptides in section S2.2.4 of the 2026 Prohibited List.
FDA flags potential immune reactions from aggregation or peptide-related impurities in compounded injectable or nasal GHRP-2, and reports serious events for which causality has not been established.
Never use a mixed vial that is cloudy or has particles in it.

Injection basics

Use a new sterile 1 mL (100-unit) U-100 insulin syringe, 27–31G, every time — never reuse or share.
Wipe the vial stopper and the skin with an alcohol swab and let both dry first.
Inject under the skin (subcutaneously) of the abdomen, thigh or upper arm, and rotate sites.
Put used syringes straight into an approved sharps container — the NDSS lists Australian disposal options.

Guidance: World Health Organization · National Diabetes Services Scheme (NDSS)

06 · QUICK ANSWERS

GHRP-2 questions

How many units is 100 mcg of GHRP-2?

With 3 mL in a 5 mg vial, the concentration is 1.67 mg/mL. A 100 mcg amount is 6 units, or 0.06 mL, on a U-100 syringe.

How much bacteriostatic water is used for a 5 mg GHRP-2 vial?

The attributed 5 mg reference protocol uses 3 mL of bacteriostatic water. That produces 1.67 mg/mL, where 100 mcg is 6 units or 0.06 mL on a U-100 syringe.

How long does a 5 mg GHRP-2 vial last?

At 100 mcg once daily, a 5 mg vial contains 50 daily amounts. At 150 mcg it contains about 33.3 daily amounts, and at 200 mcg it contains 25 daily amounts.

07 · SOURCES