Library / Peptides / Hormone Optimization / GHRP-2
Emerging evidence · Grade B

GHRP-2

GHRP-2 Acetate (Growth Hormone Releasing Peptide-2)
Evidence
Emerging
Route
Subcutaneous injection
Frequency
2-3x daily (pre-meal or before bed)
Category
Hormone Optimization
TL;DR
GHRP-2 is a synthetic hexapeptide that acts as a potent growth hormone secretagogue, stimulating the pituitary gland to release growth hormone. It binds to the ghrelin receptor (GHS-R1a) and has been studied in clinical settings for its ability to reliably increase GH, IGF-1, and ACTH/cortisol levels.
Part 01 · How it works

Mechanism.

GHRP-2 is a synthetic hexapeptide that acts as a potent growth hormone secretagogue, stimulating the pituitary gland to release growth hormone. It binds to the ghrelin receptor (GHS-R1a) and has been studied in clinical settings for its ability to reliably increase GH, IGF-1, and ACTH/cortisol levels. Among the GHRP family, GHRP-2 is considered the strongest GH releaser on a per-dose basis.

If your pituitary gland is like a fire station, GHRP-2 is an alarm bell that triggers the crew to send out fire trucks (growth hormone). It simultaneously muffles the 'stand down' signal (somatostatin) so more trucks get dispatched per alarm.

Mechanism · technical
GHRP-2 binds to the growth hormone secretagogue receptor (GHS-R1a) in the pituitary gland and hypothalamus, mimicking ghrelin's ability to trigger GH release. Unlike GHRH, which works through a different receptor pathway, GHRP-2 amplifies GH pulse amplitude by suppressing somatostatin (the hormone that inhibits GH release). It also stimulates a mild increase in cortisol and prolactin, more so than some other GHRPs like ipamorelin.
Part 02 · Dosing & administration

How it's taken.

Values below describe how GHRP-2 has been administered in published trials and labeling. Provided for educational purposes only — this is not medical advice and not instructions for self-administration. Consult your healthcare provider before making any health decision.

Standard dose
100-300 mcg
Subcutaneous injection · 2-3x daily (pre-meal or before bed)
Duration
8-12 weeks typical cycle

Ghrelin receptor agonist (GHS-R1a). Strongest GH release of GHRP family. Also stimulates prolactin and cortisol. Avoid food 30 min before/after. Not FDA-approved.

Need help with reconstitution?

Use the free peptide calculator for dilution, unit conversion, and injection volume.

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Part 03 · Safety

Side effects, rare serious events, who shouldn't.

Reported side effects
Common side effects include increased appetite (less than GHRP-6), water retention, tingling or numbness in extremities, and transient elevations in cortisol and prolactin. Some users report drowsiness after injection. Long-term safety data from large-scale human trials is limited.
Absolute · do not use
×
Active malignancy or history of cancer
×
Pituitary tumor or hypothalamic disorders
×
Diabetic retinopathy
×
Pregnancy or breastfeeding
×
Children under 18 (unless for diagnosed GH deficiency under specialist care)
×
Known hypersensitivity to GHRP-2 or any component
Interactions
Insulin
GH secretagogues increase insulin resistance; may require insulin dose adjustment
Major
Oral hypoglycemics
GH elevation may counteract glucose-lowering effects; monitor blood glucose
Moderate
Corticosteroids
Chronic corticosteroid use blunts GH release and may reduce GHRP-2 efficacy
Moderate
Thyroid hormone replacement
GH can increase T4 to T3 conversion; thyroid levels may need reassessment
Moderate
Somatostatin analogs (octreotide)
Directly antagonizes GH release stimulated by GHRP-2
Major
Labs to monitor
IGF-1
Baseline, 4 weeks, then every 3 months
Monitor growth hormone axis stimulation
Fasting Glucose & Insulin
Baseline and monthly
GH can impair insulin sensitivity
Prolactin
Baseline and at 4 weeks
GHRP-2 can elevate prolactin
Cortisol (AM)
Baseline and at 4 weeks
GHRP-2 stimulates cortisol release
CMP (Comprehensive Metabolic Panel)
Baseline and every 3 months
Liver and kidney function
Part 04 · Research log

Every study we cite.

Each study with its published finding and a plain-language note on limitations or funding.

01
1997
0
GH-releasing peptide-2 increases GH secretion in GH-deficient patients
GHRP-2 effectively stimulated GH release in both GH-deficient and normal adults
Small clinical study; well-designed crossover
PMID 9141482 ↗
02
2001
0
GHRP-2 in aging adults
Repeated GHRP-2 administration maintained GH secretagogue effect without desensitization over 30 days
Small study; short duration
Part 05 · Cost & access

Where you can get it.

Regulatory status
GHRP-2 is not FDA-approved for any clinical indication. It is available through compounding pharmacies with a prescription in the United States and is also widely sold as a research peptide. It is prohibited by WADA in competitive sports.
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Part 06 · Your appointment

Questions to bring.

01
How does GHRP-2 compare to GHRP-6 or ipamorelin for my goals?
02
What baseline labs (IGF-1, GH, cortisol, prolactin) should I have before starting?
03
Will GHRP-2's effect on cortisol and prolactin be a concern for me?
04
What is the optimal timing and dosing protocol for GHRP-2?
05
Should GHRP-2 be combined with a GHRH analog like CJC-1295 for synergy?
06
How long should I cycle GHRP-2, and is there risk of pituitary desensitization?