Ageless Pep Academy Clinical Education · Licensed Prescribers

GHRP-6

GHRP-6

Quick Facts

  • Full Name: Growth Hormone Releasing Peptide-6
  • Aliases: His-D-Trp-Ala-Trp-D-Phe-Lys-NH2
  • Category: GH Axis / Muscle / Appetite
  • Sequence: His-D-Trp-Ala-Trp-D-Phe-Lys-NH2 (hexapeptide)
  • Molecular Weight: 873.0 Da
  • Administration: Subcutaneous / Intranasal
  • Typical Dose: 100–300 mcg per injection
  • Frequency: 2–3x daily
  • Half-Life: ~15–60 minutes
  • Status: Research Only
  • WADA Status: Prohibited (S2)

What It Does

GHRP-6 is one of the original synthetic GH secretagogues — a hexapeptide ghrelin mimetic structurally similar to GHRP-2 but with notably stronger appetite stimulation. It triggers potent GH pulses via ghrelin receptor activation and is particularly valued in bulking or muscle-gain contexts where caloric surplus is desired. Its strong appetite-stimulating effect can be a benefit or a drawback depending on goals.

Mechanism of Action

  1. GHS-R1a agonism: Binds ghrelin receptor on pituitary somatotrophs → amplifies GH pulse amplitude and frequency
  2. Hypothalamic hunger signaling: Strong ghrelin receptor activation in hypothalamic arcuate nucleus → marked appetite increase (stronger than GHRP-2)
  3. Synergy with GHRH: Like all GHRPs, acts via distinct pathway from GHRH; combined use produces supra-additive GH release
  4. Cortisol and prolactin elevation: Mild, dose-dependent; more pronounced than Ipamorelin but comparable to GHRP-2
  5. IGF-1 upregulation: Secondary to GH spike; promotes anabolism

Dosing Protocols

Standard Protocol

  • Dose: 100–300 mcg SubQ
  • Frequency: 2–3x daily (morning, post-workout, bedtime)
  • Timing: Fasted state for maximal GH pulse; note significant hunger surge 30–60 min post-injection
  • Duration: 8–12 weeks on, 4 weeks off
  • Source: The Peptides Bible, Peptides Made Easy

Bulking Protocol

  • Use higher dose (250–300 mcg) 3x daily to leverage appetite stimulation for caloric surplus

Stacks Well With

  • Semaglutide – appetite counter-balance (GHRP-6 drives hunger; GLP-1 agonist moderates it)
  • Follistatin 344 – muscle growth synergy (GH + myostatin inhibition)
  • CJC-1295 NO DAC – GHRH pairing for supra-additive GH pulse
  • Sermorelin – alternative GHRH partner

Use Cases

  • GH Axis Optimization
  • Muscle Growth and lean mass accrual (bulking phases)
  • Appetite Stimulation (cachexia, hard gainers)
  • Fat Loss via GH-mediated lipolysis (when appetite is managed)
  • Recovery and tissue repair

Contraindications & Safety

  • Active malignancy — GH axis stimulation; avoid
  • Obesity / metabolic syndrome — strong appetite drive; use with caution
  • Diabetes — GH-mediated insulin resistance; monitor glucose
  • Cortisol-sensitive conditions — mild cortisol elevation possible
  • Common side effects: Intense hunger (30–60 min post-injection), water retention, tingling
  • Tachyphylaxis with very frequent dosing — maintain fasted injection timing

Storage

  • Lyophilized: -20°C long-term; 2–8°C up to 3 months
  • Reconstituted: 2–8°C for 2–4 weeks; protect from light
  • Solvent: Bacteriostatic water preferred

PubMed Research

Research links will be added after PubMed search

Sources

#GH-axis #muscle #appetite #ghrelin #GHRP #peptide #growth-hormone #bulking