Reviewed by the PeptideMind Team ยท Updated August 5, 2026

GHRP-2 Dosage Calculator, Benefits & Side Effects

GHRP-2 (Pralmorelin) dosage calculator: find how much to inject for GH release, lean mass, recovery and fat loss, plus cardioprotective research and side effects to know.

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GHRP-2 Dosage Schedule

One fasted shot before bed to trigger a growth hormone release, with less appetite stimulation than similar peptides like GHRP-6.

GHRP-2 Nightly Growth Hormone Release

10 weeks, focused on growth hormone support.

Daily dosing

Taken daily at night, on an empty stomach.

100 mcg per injection

100 mcg per injection, given just under the skin in the abdomen or thigh.

GHRP-2 triggers growth hormone release and causes less hunger than a similar peptide, GHRP-6. Its short half-life means a single nightly dose is a gentler entry point before adding a second daily dose.

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What is GHRP-2?

GHRP-2 is a lab-made, short peptide that strongly triggers the pituitary gland to release growth hormone. It's approved in Japan as a diagnostic tool for testing growth hormone deficiency, making it the only version of this type of peptide with any official government approval; it is not FDA-approved in the US. It's used in research and biohacking communities for body composition, recovery, and anti-aging support.

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What Does GHRP-2 Do?

It attaches to a receptor in the pituitary gland and hypothalamus that triggers growth hormone release, using the same internal signals as the 'hunger hormone' ghrelin. It also binds a separate cell-protection receptor that can shield tissue from stress and inflammation, independent of its growth hormone effect.

Mimics the hunger hormone

Attaches to a pituitary and hypothalamus receptor, like ghrelin does.

Triggers GH release

Sets off the internal signals that release growth hormone.

Also protects tissue

Binds a separate receptor that shields tissue from stress, independent of GH.

GHRP-2 Targeted areas

Frequently Asked Questions About GHRP-2

Straight answers on reconstitution, dosing, and safety, everything you need to research with confidence. For research reference only.

GHRP-2 Reconstitution Guide

GHRP-2 is supplied as a freeze-dried powder that must be mixed into a injectable solution before use. Available in 5mg, 10mg sizes.

5 mg lyophilized vial

GHRP-2 is supplied as a freeze-dried powder that must be mixed into a injectable solution before use. Available in 5mg, 10mg sizes.

3 mL bacteriostatic water

Adding 3 mL of bac water to a 5 mg vial gives a workable concentration for syringe dosing. More water makes microdosing easier; less concentrates each draw.

Storage after mixing

Freeze the dry powder, though it can handle room temperature for a few weeks. Once mixed with bacteriostatic water, refrigerate and use within about a month; avoid freezing and thawing it repeatedly, and split it into smaller portions if needed. After reconstitution, keep the vial refrigerated and use within 30 days.

Reconstitution steps

1

Remove caps & sanitize stoppers

2

Attach needle to syringe

3

Draw 3 mL bacteriostatic water

4

Insert needle into GHRP-2 vial

5

Release water gently down the side

6

Swirl to dissolve โ€” don't shake

7

Check for full dissolution

8

Refrigerate GHRP-2 โ€” good for 30 days

Chemical Makeup

6

Amino Acids

GHRP-2

Ala

A

Position 1

?

X

Position 2

Ala

A

Position 3

Trp

W

Position 4

Phe

F

Position 5

Lys

K

Position 6

Amino acid sequence
AlaninePosition 1
?Position 2
AlaninePosition 3
TryptophanPosition 4
PhenylalaninePosition 5
LysinePosition 6

What Are the Benefits of GHRP-2?

What research says it may help with, and how it works in the body.

growth hormone enhancement

Used in Japan as a diagnostic tool to test for growth hormone deficiency in clinical settings.

Triggers the body's own release of growth hormone by activating ghrelin receptors, the same receptors that respond to the hunger hormone ghrelin.

Indirectly raises IGF-1 levels, a growth-related hormone, by boosting growth hormone release.

body composition

Improves fat breakdown and body composition by increasing fat-burning through growth hormone activity.

Speeds up recovery from exercise and improves sleep quality.

Boosts muscle protein building by raising growth hormone and IGF-1 levels.

protective effects

Helps protect muscle in models of muscle wasting by stimulating the GHS-R1a receptor, the same receptor that responds to growth-hormone-releasing signals.

Shown to help protect cells from damage in research on heart tissue.

What Are the Side Effects of GHRP-2?

Who should avoid it, warning signs to watch for, and what to know before combining it with other compounds.

Who Should Avoid It

Active cancer or history of cancer

Pregnancy or breastfeeding

Pituitary disorders

Diabetic retinopathy

WADA prohibited for competitive athletes

Stop Right Away If You Notice

Severe or persistent headaches

Unusual swelling in hands or feet

Signs of carpal tunnel syndrome

Allergic reactions

Milder Signs to Watch For

Discolored or yellow powderCloudy solution after reconstitutionParticles or precipitates in solution
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Is GHRP-2 FDA approved?

GHRP-2 is not an FDA-approved drug. It is intended for research purposes only and is not approved for human consumption, diagnostic, or therapeutic use.

Research Use Only

GHRP-2 has not been evaluated by the FDA for safety or efficacy in humans.

No Clinical Oversight

Not manufactured under FDA-regulated quality or clinical standards.

Unregulated Sourcing

Purity, dosing, and sourcing are not verified through FDA testing or oversight.

A smartphone screen displaying FDA status for a drug, indicating "FDA approved drug: No" and "Classification: Research use only." A banner notes "Research Only" with the disclaimer "not for human use," emphasizing its intended use for laboratory and analytical purposes.

GHRP-2 Cycle Length: How Long Should It Last?

This breaks down how long a typical GHRP-2 cycle runs and what research suggests happens at each stage. Research shows that staying on a peptide continuously, without a break, may make it less effective over time.

That's why most research protocols build in a break between cycles, often called a washout period, to let the body reset before starting again.

Week 0-0
GH spike within 15-30 minutes of injection
Week 1-2
Improved sleep quality and recovery
Week 2-4
Noticeable improvements in energy and well-being
Week 4-8
Visible changes in body composition and muscle fullness
Week 8-12
Full benefits realized with consistent use

GHRP-2 Research References

It is an approved compound

3Research references

GHRP-2

GHRP-2 is an approved compound

Growth Hormone Releasing Peptide-2 increases food intake in healthy men

GHRP-2 infusion increased food intake by 35.9% compared to saline, demonstrating ghrelin-like orexigenic effects.

n.d.

Synthetic Growth Hormone-Releasing Peptides: Cytoprotective Effects

GHRPs including GHRP-2 demonstrated significant cytoprotective effects in cardiac and extracardiac tissues.

n.d.

GHRP-2 effects on growth hormone release in swine

Chronic GHRP-2 administration increased average daily gain by 22.35% and feed efficiency by 20.64%.

n.d.