Peptide Schedule
GHRP-26 residues (approx.)AAWFKEach bubble = one amino acid. Size = residue mass. Color = chemical class.Uses closest standard amino acids for non-standard residues.GHRP-2
Benefits
About GHRP-2
GHRP-2 (Growth Hormone Releasing Peptide-2) is a second-generation GH secretagogue that stimulates the pituitary gland via the ghrelin receptor. It produces a stronger GH pulse than Ipamorelin but with fewer side effects than GHRP-6. It causes a moderate increase in appetite (less than GHRP-6) and slight elevations in cortisol and prolactin. It's widely used in research and clinical settings as a reliable GH-releasing agent.
Who Should Consider GHRP-2
- Adults over 30 experiencing age-related GH decline (somatopause)
- Athletes and bodybuilders seeking enhanced recovery and lean mass
- Individuals on lean bulking protocols who benefit from moderate appetite increase
- Adults with poor sleep quality seeking improved deep sleep
- Patients undergoing GH stimulation testing for pituitary function assessment
How GHRP-2 Works
GHRP-2 (pralmorelin) is a synthetic hexapeptide that binds the growth hormone secretagogue receptor (GHS-R1a), a G-protein coupled receptor expressed on pituitary somatotrophs and hypothalamic neurons. By mimicking ghrelin at GHS-R1a, GHRP-2 activates phospholipase C and protein kinase C signaling, which depolarizes somatotrophs and triggers a rapid GH pulse. It also acts at the hypothalamic level to stimulate GHRH neurons and suppress somatostatin tone. Compared to GHRP-6, GHRP-2 produces a stronger GH release per unit dose with less appetite stimulation, and causes only mild, transient elevations in cortisol and prolactin through partial activation of ACTH-releasing pathways.
What to Expect
Improved sleep depth and recovery. Moderate appetite increase becomes noticeable. Mild water retention may occur as GH pulses elevate.
Recovery between training sessions improves. Skin quality begins to improve. Energy levels and mood stabilize. GH-mediated fat oxidation starts.
Body composition shifts become visible — reduced abdominal fat, improved muscle fullness. Joint and connective tissue feel better.
Peak benefits for body composition and recovery. Hair and nail growth may accelerate. Sustained fat loss with preserved lean mass.
Consider cycling off for 2-4 weeks to maintain pituitary sensitivity. Benefits plateau without periodic breaks.
Dosing Protocol
| Level | Dose / Injection | Frequency |
|---|---|---|
| Beginner | 100mcg | Daily |
| Moderate | 200mcg | 2x Daily |
| Aggressive | 300mcg | 3x Daily |
Note: Second-generation GHRP. Moderate hunger increase. Stronger GH pulse than Ipamorelin but cleaner than GHRP-6. Best on empty stomach. Stacks well with a GHRH peptide.
How to Inject GHRP-2
Inject subcutaneously on an empty stomach — no food for 30 minutes before or after injection. Best timing is before bed to amplify the natural nocturnal GH pulse, or first thing in the morning. For enhanced GH output, stack with a GHRH peptide (CJC-1295 No DAC or Sermorelin) injected at the same time. Rotate injection sites between abdomen, thigh, and upper arm.
Cycling Protocol
Continuous use may reduce GH response over time due to receptor desensitization. Cycle 8 weeks on, 4 weeks off. Some users run 5 days on, 2 days off within each cycle week to preserve sensitivity.
Pharmacokinetics
Source: Phase I pediatric PK study (Yen et al. 1998, PMID 9543140); t½β = 0.55 ± 0.14 h
Loading the interactive decay curve.
Side Effects
Increased appetite (moderate). Mild cortisol and prolactin elevation. Water retention. Tingling and dizziness post-injection.
Contraindications
- Active cancer or history of malignancy — GH promotes cell proliferation
- Uncontrolled diabetes mellitus or diabetic retinopathy — GH antagonizes insulin and may worsen glycemic control
- Pregnancy or breastfeeding — effects on fetal development not established
- Active pituitary tumors or intracranial neoplasms
- Known hypersensitivity to GHRP-2 (pralmorelin) or any excipients
Drug Interactions
- Insulin and oral hypoglycemics — GH release antagonizes insulin action; blood glucose monitoring required
- Corticosteroids — chronic use may blunt GH response and reduce GHRP-2 efficacy
- Other GH secretagogues (GHRP-6, hexarelin, ipamorelin) — additive GH release increases risk of side effects; avoid stacking without medical guidance
- Thyroid hormones — GH can accelerate T4-to-T3 conversion; monitor thyroid function during use
- Somatostatin analogs (octreotide, lanreotide) — directly inhibit GH release, counteracting GHRP-2 effects
Storage & Stability
Molecular Profile
Related Peptides
References
- Growth Hormone Releasing Peptide-2 (GHRP-2), Like Ghrelin, Increases Food Intake in Healthy MenPubMed 15699539
- Effects of GHRP-2 and Hexarelin on GH, Prolactin, ACTH and Cortisol Levels in ManPubMed 9285939
- Pharmacokinetics and Pharmacodynamics of Growth Hormone-Releasing Peptide-2: A Phase I Study in ChildrenPubMed 9543140
- Treatment Effects of Intranasal Growth Hormone Releasing Peptide-2 in Children with Short StaturePubMed 9390009
- Growth Hormone-Releasing Peptides: Clinical and Basic AspectsPubMed 8950613