01 · At a glance
Quickstart Highlights
GHRP-2 (Growth Hormone-Releasing Peptide-2) is a synthetic hexapeptide that acts as a ghrelin / GHS-R1a receptor agonist, prompting the pituitary to release a dose-dependent pulse of growth hormone[1][2]. Unlike the more selective ipamorelin, it also modestly raises cortisol and prolactin, and it is often stacked with a GHRH analog such as CJC-1295. This educational page outlines a once-daily subcutaneous approach dosed in micrograms with a dilution chosen so doses land on easy-to-read insulin-syringe marks. It is an unapproved research chemical — not FDA-approved for any human use, WADA-prohibited, and its anti-aging or body-composition benefit claims are not established by rigorous human outcome trials — presented for research and educational use only.
Reconstitute
Add 3.0 mL bacteriostatic water to one 5 mg vial → ~1.67 mg/mL (1,667 mcg/mL), the largest practical dilution for accurate dosing.
Daily range
100–300 mcg once daily, titrated upward gradually across an 8–16 week course (about ~1.4 mg per week on average).
Easy measuring
At ~1.67 mg/mL, 1 unit ≈ 16.7 mcg; 100 mcg ≈ 6 units and 300 mcg ≈ 18 units on a U-100 syringe.
Storage
Lyophilized: store at −20 °C (−4 °F); once reconstituted, refrigerate at 2–8 °C (35.6–46.4 °F) and do not freeze the solution.
i
Important: Start with the Prep & Injection Guide — it covers the preparation and safety basics every protocol on this site assumes.
02 · Dosing & reconstitution
Dosing & Reconstitution Guide
A single practical dilution with accurate once-daily dosing, step by step
Standard / Gradual Approach (3 mL = ~1.67 mg/mL)
▪
Reconstitute: Add 3.0 mL bacteriostatic water to one 5 mg vial → final concentration ~1.67 mg/mL (1,667 mcg/mL).
▪
Typical daily range: 100–300 mcg once daily on an empty stomach, raised gradually over an 8–16 week course.
▪
Easy measuring: At ~1.67 mg/mL, 1 unit ≈ 16.7 mcg on a U-100 syringe. For small ≤10-unit volumes, a 30- or 50-unit insulin syringe improves readability.
▪
Storage: Lyophilized: store at −20 °C (−4 °F); after reconstitution, refrigerate at 2–8 °C (35.6–46.4 °F) and do not freeze the mixed solution.
Phase / Week(s) Dose & Frequency Volume (U-100 units / mL) Weeks 1–2 100 mcg (1× daily) ~6 units (0.06 mL) Weeks 3–4 150 mcg (1× daily) ~9 units (0.09 mL) Weeks 5–8 200 mcg (1× daily) ~12 units (0.12 mL) Weeks 9–16 200–300 mcg (1× daily) ~12–18 units (0.12–0.18 mL)
Frequency: one subcutaneous injection each day on an empty stomach (roughly 20–30 minutes before or after food, since carbohydrate and fat blunt the GH pulse), titrating up as tolerated. Once-daily dosing balances efficacy with receptor recovery, avoiding the tachyphylaxis seen with very frequent administration[3]; evening dosing may align with nocturnal GH rhythms[4]. These figures come from reference protocols, not from approved human dosing.
Reconstitution Steps
1
Draw 3.0 mL of bacteriostatic water into a sterile syringe.
2
Release it slowly down the vial’s inner wall to limit foaming.
3
Swirl or roll gently until fully dissolved — don’t shake.
4
Label with the date and concentration, then refrigerate at 2–8 °C (35.6–46.4 °F), shielded from light.
Note
The 3.0 mL dilution is deliberately large so each dose reads at 30 units or more, where U-100 syringe markings are most precise. Avoid freezing the reconstituted solution, since freeze–thaw can denature the peptide.
Important: This guide is for educational purposes only and is not medical advice. For research use only. Not for human consumption.
03 · What you’ll need
Supplies Needed
Quantities below assume an 8–16 week course of once-daily injections with gradual titration. At microgram doses a single 5 mg vial lasts well over a week, so far fewer vials are needed.
✓Peptide Vials (GHRP-2, 5 mg each)
A 5 mg vial covers roughly two weeks at these microgram doses, so only a few vials are needed per cycle.
8 weeks: ~2 vials 12 weeks: ~4 vials 16 weeks: ~5 vials
✓Insulin Syringes (U-100, 1 mL)
Per injection: 1 syringe 8 weeks (once daily): ~56 syringes 16 weeks (once daily): ~112 syringes
✓Bacteriostatic Water (10 mL bottles)
Use ~3.0 mL per 5 mg vial for reconstitution.
8 weeks (2 vials): ~6 mL → 1 bottle 16 weeks (5 vials): ~15 mL → 2 bottles
✓Alcohol Swabs
One for the vial stopper + one for the injection site each day.
Per injection: 2 swabs 8 weeks (once daily): ~112 swabs → 1–2 boxes
Protocol Overview
A concise summary of the once-daily regimen, drawn from commonly cited reference protocols.
▪Goal: Stimulate endogenous, pulsatile growth-hormone secretion through ghrelin / GHS-R1a receptor activation[1]. GH/IGF-1-raising effects are documented; downstream anti-aging or body-composition benefits are not established in humans. ▪Schedule: Daily subcutaneous injections on an empty stomach for 8–12 weeks, optionally extended to ~16 weeks for longer research goals. ▪Dose Range: 100–300 mcg per day with gradual titration; higher doses are dose-dependent but may add little with routine use[4]. ▪Reconstitution: 3.0 mL bacteriostatic water per 5 mg vial gives ~1.67 mg/mL for accurate unit measurements. ▪Storage: Keep the dry vial frozen at −20 °C (−4 °F); once mixed, refrigerate at 2–8 °C and do not freeze the solution.
Dosing Protocol
A suggested daily titration approach based on common reference doses.
▪Start: Begin at 100 mcg once daily (Weeks 1–2) to gauge tolerability while still eliciting a strong GH pulse. ▪Titrate: Move to 150 mcg daily (Weeks 3–4), then 200 mcg (Weeks 5+) as tolerated. ▪Target: Reach about 200 mcg daily by weeks 5–16; advanced researchers may optionally use 250–300 mcg. ▪Cycle Length: Typically 8–12 weeks; some references extend to ~16 weeks. ▪Timing: Inject on an empty stomach at a consistent time each day (evening may suit nocturnal GH rhythms) and rotate injection sites systematically.
Storage Instructions
Correct storage is what preserves the peptide’s stability and activity.
▪Lyophilized: Hold the dry vial at −20 °C (−4 °F) in dry, dark conditions and limit moisture exposure[7]. ▪Reconstituted: Refrigerate at 2–8 °C (35.6–46.4 °F) and use within about 28 days; do not freeze the mixed solution, as freezing can denature peptides[8]. ▪Handling: Let frozen vials warm to room temperature before opening so condensation won’t form, and keep the solution clear of heat and direct light. ▪Freeze–thaw: Avoid repeated freeze–thaw cycles of the reconstituted solution.
04 · Good to know
Important Notes
Practical points that keep daily administration safe and consistent.
▪Sterile technique: Use a fresh sterile U-100 insulin syringe each time and drop it straight into a puncture-proof sharps container afterward. ▪Site rotation: Move between abdomen, thighs and upper arms to reduce local irritation and lipohypertrophy[9]. ▪Avoid over-frequent dosing: Very frequent administration (e.g., every few hours) causes progressive attenuation (tachyphylaxis); once-daily dosing avoids this[3]. ▪Recordkeeping: Log the daily dose, injection site and any observations to keep the protocol consistent. ▪Regulatory note: GHRP-2 is prohibited by WADA for athletic use and is not FDA-approved for any human administration[10].
05 · How it works
How This Works
GHRP-2 is a synthetic hexapeptide growth-hormone secretagogue. It binds and activates the ghrelin receptor (GHS-R1a) on the pituitary and hypothalamus[1][2], mimicking the natural hormone ghrelin.
Receptor activation triggers a potent, dose-dependent pulse of growth hormone from the pituitary[4]. Unlike the highly selective ipamorelin, GHRP-2 also modestly raises cortisol and prolactin and can stimulate appetite via ghrelin signalling. It is frequently stacked with a GHRH analog such as CJC-1295, which acts on a separate receptor for an additive GH response.
Clinical studies in GH-deficient children showed meaningful GH increases even at low doses, and in healthy adults ~100 mcg SC daily produces acute GH stimulation[2][3]. Frequency matters: very frequent dosing causes acute tachyphylaxis, so once-daily schedules are used to preserve receptor sensitivity.
Important caveat: while GHRP-2’s effect on GH and IGF-1 is well documented, the downstream anti-aging, fat-loss and muscle-building benefits often attributed to it are not established by rigorous human outcome trials. Raising GH/IGF-1 is not the same as proven clinical benefit, and the long-term safety of chronic use in healthy adults is unknown. Such claims should be read as hypotheses.
GHRP-2 is not an approved medicine. It is an unapproved research chemical — not FDA-approved for any human use and prohibited by WADA — presented here for research and educational purposes only.
06 · Daily habits
Lifestyle Factors
Habits that may complement elevated GH alongside the protocol.
▪Nutrition: Keep protein intake adequate to support the anabolic effects of elevated GH; dose on an empty stomach. ▪Activity & rest: Pair resistance training with real recovery time to support body-composition goals. ▪Sleep: Aim for 7–9 hours to support the body’s natural repair processes. ▪Stress: Manage stress with evidence-based practices, since it influences overall healing.
07 · What to expect
Potential Benefits & Side Effects
What clinical and preclinical literature describe; downstream benefits are not established and individual results vary.
Potential Benefits
▪GH/IGF-1 elevation (documented): Produces robust pulsatile GH release; combined with a GHRH analog it can meaningfully raise IGF-1[5][6]. ▪Body-composition (hypothesised): GH elevation is sometimes claimed to support fat loss and lean mass, but these outcomes are not established in rigorous human trials. ▪Tolerability: Generally well tolerated in clinical trials at these dose ranges, with a largely placebo-like profile[7]. ▪Note: GHRP-2 is an unapproved research chemical; anti-aging and body-composition benefit claims are not established by rigorous human outcome trials.
Common Side Effects
▪Hunger, cortisol & prolactin: Transient hunger or flushing can occur; GHRP-2 modestly raises cortisol and prolactin (more so than ipamorelin)[7]. ▪Unknown long-term profile: Long-term safety of chronic use in healthy adults is unknown; caution and monitoring are advised. ▪Sport restriction: Note that GHRP-2 is a WADA-prohibited substance for athletes.
08 · Injection technique
Injection Technique
General subcutaneous technique, following established clinical best-practice guidance[14][15].
Pre-Injection Preparation
▪Wash your hands well with soap and water. ▪Wipe the vial stopper with an alcohol swab and let it air-dry. ▪Choose a site (abdomen, thigh, or upper arm) and clean it with a fresh alcohol swab, letting it dry fully[15]. ▪Draw the intended dose, then check for air bubbles and push any out.
Injection Procedure
▪Pinch a skinfold at the chosen site between thumb and forefinger. ▪Insert the needle into the pinch at a 45–90-degree angle (use 45 degrees if the fat layer is thin)[14]. ▪Skip aspiration for subcutaneous shots — it isn’t needed[14]. ▪Press the plunger slowly and steadily until it’s fully down. ▪Wait 5–10 seconds, then pull the needle straight out to prevent leakage.
Post-Injection Care
▪Drop the used syringe straight into a puncture-proof sharps container — never recap a needle. ▪Return the reconstituted vial to the fridge right away. ▪Rotate the injection site each day to prevent irritation and lipohypertrophy[9]. ▪Watch the site for excess redness, swelling, or signs of infection.
09 · Where to source
Recommended Source
For high-purity research peptides, we point researchers to Prime Lab Peptides for GHRP-2 (5 mg).
Why Prime Lab Peptides?
▪Top-rated on Trustpilot: Independently reviewed as the highest-rated peptide lab on Trustpilot — making it the best current source in the USA. ▪Third-party tested: Every batch ships with a Certificate of Analysis (COA) confirming purity and composition. ▪Consistent quality: ISO-aligned manufacturing and handling keep product integrity reliable batch to batch. ▪Cold-chain integrity: Temperature-controlled shipping and storage across the whole fulfilment chain. ▪Research-grade purity: Fit for educational and research use that demands high-quality peptides.
Note: Product availability and specifications subject to change. Verify current product details on supplier website.
Shop at Prime Lab Peptides →
10 · The evidence
References
1
Domestic Animal Endocrinology
Effects of GHRP-2 on growth hormone release and growth performance, illustrating ghrelin-receptor activation.
View Source ↗ 2
J Clin Endocrinol Metab
Eight-month treatment with graded doses of GHRP-2 in GH-deficient children: sustained GH/IGF-1 response.
View Source ↗ 3
Eur J Endocrinol
Five-day daily subcutaneous GHRP-2 in healthy young men: response attenuation and IGF-I effects.
View Source ↗ 4
Endocrine
GH/IGF-1 response to acute and chronic GHRP-2, GHRH(1-44) and their combination in older adults.
View Source ↗ 5
American Journal of Men’s Health
Growth-hormone secretagogue treatment in hypogonadal men raises serum IGF-1 levels.
View Source ↗ 6
Sexual Medicine Reviews (PMC)
The safety and efficacy of growth-hormone secretagogues: a comprehensive review.
View Source ↗ 7
Genaxxon Bioscience
Product information: Growth Hormone-Releasing Peptide-2 (GHRP-2) technical specifications.
View Source ↗ 8
Peptide Storage Guide
Best practices for storing lyophilized peptides (temperature, humidity and light protection).
View Source ↗ 9
NCBI Bookshelf
Best practices for subcutaneous injection: aseptic technique and site rotation.
View Source ↗ 10
WADA Prohibited List
Classification of GHRP-2 and growth-hormone secretagogues as prohibited in competitive sport.
View Source ↗ 11
Ghrelin Receptor (GHS-R1a) Pharmacology
Ghrelin / GHS-R1a receptor signalling and growth-hormone secretagogue mechanism of action.
View Source ↗ 12
Cortisol & Prolactin (GHRPs)
GHRP-class peptides modestly raise cortisol and prolactin relative to selective secretagogues.
View Source ↗ 13
U.S. FDA
GHRP-2 is an unapproved new drug; not FDA-approved for any human use.
View Source ↗ 14
CDC
Subcutaneous injection technique: angle, site and no-aspiration guidance.
View Source ↗ 15
Subcutaneous Injection Technique (Patient Education)
How to administer a subcutaneous injection: clinical technique guidelines.
View Source ↗