GHRP-6
One of the original growth hormone releasing peptides. GHRP-6 stimulates your pituitary to release GH in natural pulses — but comes with significant appetite increase that sets it apart from newer alternatives.
GHRP-6 binds to the ghrelin receptor in your pituitary gland, triggering growth hormone release in a pulsatile pattern that mimics your body's natural rhythm. It's one of the most studied GH-releasing peptides, but its strong appetite-stimulating effect (from ghrelin receptor activation) makes newer alternatives like ipamorelin or GHRP-2 often preferred.
Who's interested: People seeking growth hormone elevation for body composition, recovery, or anti-aging. Those who want appetite stimulation may actually prefer GHRP-6 over cleaner alternatives.
Dive deeper into the researchPotential side effects
- Strong appetite increase (ghrelin activation) — most notable effect
- Water retention and mild bloating
- Potential cortisol and prolactin elevation at higher doses
What does GHRP-6 do?
GHRP-6 stimulates your pituitary gland to release growth hormone by activating the ghrelin receptor (GHS-R1a). Unlike exogenous GH injections that deliver a flat, unnatural dose, GHRP-6 triggers your body to produce GH in its natural pulsatile pattern — which is better for maintaining feedback sensitivity.
The catch: because it activates the same receptor as ghrelin (your hunger hormone), GHRP-6 causes significant appetite increase. For some people this is a feature (hardgainers, those needing to eat more). For most, it's a drawback — which is why newer peptides like ipamorelin were developed.
Who uses it?
- Body composition — seeking GH-mediated fat loss and lean mass gains
- Recovery — accelerating healing from injuries or intense training
- Appetite stimulation — people who struggle to eat enough (underweight, recovery from illness)
- Anti-aging — restoring youthful GH levels that decline with age
What to know before trying
- Hunger is intense — expect strong appetite increase 15–30 minutes after injection, lasting 1–2 hours
- Timing matters — inject on an empty stomach; fats and carbs within 30 minutes blunt GH release
- Stack with GHRH — combining with CJC-1295 or sermorelin amplifies GH release synergistically
- Cortisol and prolactin — GHRP-6 raises these more than GHRP-2 or ipamorelin, especially at higher doses
- 3x daily dosing — short half-life means multiple injections per day for best effect
Tracking a peptide protocol?
eterni connects your labs, supplements, and retests — so you can see whether your protocol is actually working.
Get early accessFrequently Asked Questions
GHRP-6 vs GHRP-2 vs Ipamorelin — which should I use?
GHRP-6 gives the strongest GH release but also the most hunger, cortisol, and prolactin elevation. GHRP-2 is slightly cleaner with moderate hunger. Ipamorelin is the cleanest — minimal hunger, no cortisol/prolactin effects — but the weakest GH release. Most people prefer GHRP-2 or ipamorelin for this reason.
How much does GHRP-6 increase GH?
At 100–300 mcg subcutaneously, GHRP-6 increases GH release by 3–6x above baseline. When combined with a GHRH peptide (CJC-1295 or sermorelin), the synergistic effect can be 8–12x baseline.
Why does GHRP-6 make you so hungry?
GHRP-6 activates the ghrelin receptor (GHS-R1a) — the same receptor activated by ghrelin, your hunger hormone. This dual action (GH release + appetite stimulation) is inherent to the mechanism and cannot be separated.
Is GHRP-6 available in India?
GHRP-6 is widely available from peptide vendors in India as a research chemical. It is not approved as a drug or supplement. Quality varies — request third-party HPLC testing.
How it works in your body
- Ghrelin receptor agonism — binds GHS-R1a on pituitary somatotrophs, triggering GH release
- Pulsatile GH — preserves natural GH pulsatility unlike exogenous GH
- Appetite center activation — ghrelin receptor in hypothalamus drives hunger signaling
- Cortisol co-release — stimulates modest ACTH and cortisol release
- Prolactin elevation — dose-dependent increase, typically clinically insignificant
GHRP comparison
| GHRP-6 | GHRP-2 | Ipamorelin | |
|---|---|---|---|
| GH release | Strong | Strong | Moderate |
| Hunger | Significant | Moderate | Minimal |
| Cortisol | Elevated | Mild | None |
| Prolactin | Elevated | Mild | None |
Side effects & safety
- Intense hunger — the most significant effect; can undermine fat loss goals
- Water retention — mild edema typical of elevated GH
- Cortisol elevation — modest but real; could be problematic with chronic use
- Prolactin — typically mild and transient at standard doses
- Injection site reactions — mild redness and itching
- Fasting glucose — GH elevation can impair insulin sensitivity; monitor HbA1c
Who should avoid it: People with active cancer, uncontrolled diabetes, pituitary tumors, or those who cannot manage the appetite increase.
Which labs to monitor
- IGF-1 — primary marker of GH activity
- Fasting glucose & HbA1c — GH affects insulin sensitivity
- Prolactin — monitor for elevation
- Morning cortisol — track for excessive elevation
Know what's working. Know what's not.
eterni connects your lab results, supplements, and retests — so you can see the trajectory, not just a snapshot.
Join the waitlist