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GHRP-6

GH Secretagogue (GHS-R1a agonist)

Also known as: Growth Hormone-Releasing Peptide-6 · His-DTrp-Ala-Trp-DPhe-Lys-NH2

One of the original GH-releasing peptides with potent ghrelin-pathway activity & pronounced appetite stimulation — useful in bulking or muscle wasting contexts.

Typical Dose

100–200 mcg per injection, 1–3x daily

Route

Subcutaneous injection

Cycle

12–24 weeks

Half-life

~15–60 minutes

Storage

Lyophilized: room temp or freezer. Reconstituted: 2–8°C, use within 30 days.

Overview

GHRP-6 is a hexapeptide GH secretagogue that acts on both the GHS-R1a (ghrelin) receptor & a secondary, non-ghrelin pathway to stimulate GH release. Unlike Ipamorelin, it strongly activates ghrelin pathways in the gut & hypothalamus, producing significant appetite stimulation that can be a therapeutic advantage or a limitation depending on the goal.

GH output from GHRP-6 is comparable to GHRP-2 with similar cortisol & prolactin elevation. The appetite-stimulating effect is its most distinctive feature — users often report intense hunger within 20–30 minutes of injection, which makes it particularly useful in anabolic or muscle-building protocols where caloric intake needs to be elevated.

Quick Start Guide

1

Reconstitute with 2 mL bacteriostatic water per 2 mg vial.

2

Inject 100 mcg subcutaneously, ideally with a GHRH analog (CJC-1295) 30 min before sleep.

3

Have food ready: intense hunger typically sets in 20–30 minutes after injection.

Research Indications

GH pulse stimulation

Most Effective

Strong GH pulse comparable to GHRP-2. Most effective when combined with a GHRH analog.

Appetite stimulation / bulking

Most Effective

The most potent appetite-stimulating GHRP available. Used intentionally in muscle-building protocols to drive caloric surplus.

Muscle wasting / cachexia

Effective

The combined effect of GH increase & appetite stimulation makes GHRP-6 well-suited for cachexia & muscle wasting contexts.

Research Protocols

Bulking / muscle building

16–24 weeks

Dose

100–200 mcg + 100 mcg CJC-1295 (no DAC)

Frequency

3x daily (fasted; pre-sleep minimum)

Route

SubQ abdomen

Consume a meal 20–30 min after injection to capitalize on appetite stimulation.

GH optimization (less aggressive)

12–24 weeks

Dose

100 mcg once daily pre-sleep

Frequency

Once daily

Route

SubQ abdomen

Peptide Interactions

GHRH/GHRP synergy; produces synergistic GH pulse greater than either alone.

IpamorelinCompatible

Both act on GHS-R1a; don't stack two GHRPs. Choose one based on appetite goals.

Side Effects & Safety

Common

  • Intense hunger within 20–30 min of injection
  • Cortisol elevation
  • Prolactin elevation
  • Water retention
  • Flushing

Uncommon

  • Tingling
  • Headache
  • Fatigue

When to Stop

  • Known or suspected malignancy
  • Signs of allergic reaction
  • Diabetics: monitor glucose

How to Reconstitute

1

Wipe stopper with alcohol.

2

Draw 2 mL bacteriostatic water.

3

Inject slowly down inner wall. Swirl gently.

4

Refrigerate at 2–8°C.

Dosing math: 2 mL BAC water per 2 mg vial = 1000 mcg/mL. For 100 mcg: 0.1 mL.

Quality Indicators

Good — use as normal

  • Clear, colorless solution

Acceptable

  • Minor cloudiness clearing on swirl

Discard immediately

  • Persistent cloudiness
  • Particulate
  • Discoloration

What to Expect

Week 1–2

Intense hunger after injections. GH pulses active immediately. Sleep improvement common.

Week 3–8

IGF-1 rising. Muscle fullness & recovery improving. Body weight increasing in caloric surplus.

Week 9–24

Sustained anabolic environment with consistent GH pulsing & elevated caloric intake.

Community Insights

Self-reported. Reflects user experience, not clinical outcomes.

Research References

Growth hormone-releasing hexapeptide (GHRP-6) stimulates GH secretion in normal volunteers & in growth hormone-deficient patients

Journal of Clinical Endocrinology & Metabolism · 1991

Original human characterization study of GHRP-6; established GH-releasing potency & dose-response.

Verify what you have

Information on this page applies to pharmaceutical-grade peptides. Purity & identity of research-grade products vary. Certipep provides independent ESI-TOF-MS & HPLC analysis with a signed analytical report.

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