GHRP-6: Dosing Protocols
Dosing guidelines, reconstitution, and administration information
📌TL;DR
- •4 dosing protocols documented
- •Reconstitution instructions included
- •Storage: Lyophilized GHRP-6 should be stored at -20 degrees C or below for long-term storage. Reconstituted solutions should be refrigerated at 2-8 degrees C and used within 2-4 weeks. Protect from light and repeated freeze-thaw cycles.
Protocol Quick-Reference
Growth hormone secretion, appetite stimulation, and body composition improvement
Dosing
Amount
100-300 mcg per injection
Frequency
2-3 times daily
Duration
8-12 weeks, then 2-4 weeks off
Administration
Route
SCSchedule
2-3 times daily
Timing
On empty stomach, 30+ min before meals; morning, post-workout, and/or before bed
✓ Rotate injection sites
Cycle
Duration
8-12 weeks, then 2-4 weeks off
Rest Period
4 weeks off between cycles
Repeatable
Yes
Preparation & Storage
Diluent: Bacteriostatic water
Storage: Lyophilized GHRP-6 should be stored at -20 degrees C or below for long-term storage. Reconstituted solutions should be refrigerated at 2-8 degrees C and used within 2-4 weeks. Protect from light and repeated freeze-thaw cycles.
⚗️ Suggested Bloodwork (6 tests)
IGF-1
When: Baseline
Why: Baseline growth hormone activity marker
Fasting glucose and HbA1c
When: Baseline
Why: GH peptides can affect glucose metabolism
Fasting insulin
When: Baseline
Why: Assess baseline insulin sensitivity
CBC with differential
When: Baseline
Why: Baseline blood cell counts
Cortisol (AM)
When: Baseline
Why: GHRP-6 can elevate cortisol at higher doses
Prolactin
When: Baseline
Why: GHRP-6 can elevate prolactin at higher doses
💡 Key Considerations
- →Intermittent dosing (5 days on / 2 days off) may reduce desensitization
- →Contraindication: Avoid in active cancer, pituitary disorders, or uncontrolled diabetes
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| Purpose | Dose | Frequency | Duration | Notes |
|---|---|---|---|---|
| GH stimulation test (diagnostic, IV) | 1 mcg/kg | Single IV bolus | Acute diagnostic test | Used as a provocative test for GH deficiency assessment |
| GH secretion research (SC) | 1-2 mcg/kg | 1-3 times daily | Varies by study protocol | Subcutaneous injection; GH peak at 15-30 minutes |
| Synergy study with GHRH | 1 mcg/kg GHRP-6 + 1 mcg/kg GHRH | Single combined administration | Acute diagnostic test | Synergistic GH response exceeding sum of individual stimuli |
| Intranasal (research) | 10-30 mcg/kg | Variable | Varies by study | Lower bioavailability (~10-20% vs IV); higher dose required |
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💉Reconstitution Instructions
Lyophilized GHRP-6 is typically reconstituted with bacteriostatic water or sterile water for injection. Research-grade vials (commonly 5 mg) are reconstituted to desired concentration. Gentle swirling rather than vigorous shaking is recommended.
Recommended Injection Sites
- ✓Subcutaneous (abdomen, deltoid region)
- ✓Intravenous (clinical research settings)
- ✓Intranasal (research, lower bioavailability)
🧊Storage Requirements
Lyophilized GHRP-6 should be stored at -20 degrees C or below for long-term storage. Reconstituted solutions should be refrigerated at 2-8 degrees C and used within 2-4 weeks. Protect from light and repeated freeze-thaw cycles.
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Before You Begin
Review safety warnings and contraindications before starting any protocol.
Research Dosing Disclaimer#
GHRP-6 is not approved for therapeutic use. All dosing information is derived from clinical research studies and is provided for educational reference only.
Clinical Research Dosing#
Intravenous Administration#
The most extensively studied route for GHRP-6 is intravenous bolus injection, used primarily in clinical pharmacology studies and as a provocative test for GH deficiency:
- Standard GH stimulation dose: 1 mcg/kg IV bolus
- Dose-response studies: 0.1, 0.3, 1.0, 3.0 mcg/kg IV
- Combined testing: 1 mcg/kg GHRP-6 + 1 mcg/kg GHRH IV
The GHRP-6 GH-stimulation test has been proposed as a diagnostic tool for GH deficiency, particularly in pediatric populations. A GH peak below established cut-offs following GHRP-6 stimulation suggests impaired GH secretory capacity.
Subcutaneous Administration#
Subcutaneous injection is the most practical route for repeated dosing:
- Research protocols: 1-2 mcg/kg per injection
- Frequency: 1-3 times daily, often timed to correspond with natural GH pulse patterns (e.g., before meals, before sleep)
- Timing considerations: Administration on an empty stomach may produce a more robust GH response, as elevated blood glucose and free fatty acids can attenuate GH release
Intranasal Administration#
Intranasal GHRP-6 has been investigated as a non-invasive route of administration:
- Doses studied: 10-30 mcg/kg
- Bioavailability: Approximately 10-20% relative to IV administration
- Variability: Greater inter-individual variability compared to injectable routes
- Practicality: Offers needle-free administration but with less predictable absorption
Pharmacokinetic-Pharmacodynamic Considerations#
Timing of GH Response#
The GH response to GHRP-6 follows a predictable temporal pattern regardless of route:
| Parameter | IV Administration | SC Administration |
|---|---|---|
| Onset of GH rise | 5-10 minutes | 10-15 minutes |
| Peak GH level | 15-20 minutes | 20-30 minutes |
| Return to baseline | 90-120 minutes | 120-180 minutes |
| Peak GH magnitude | 20-80 ng/mL | 15-60 ng/mL |
Dose-Response Relationship#
The dose-response curve for GHRP-6-stimulated GH release is sigmoid-shaped with:
- Threshold dose: Approximately 0.1 mcg/kg IV
- ED50: Approximately 0.3-1.0 mcg/kg IV
- Maximal response: Approximately 1-3 mcg/kg IV
- Plateau: Higher doses do not produce proportionally greater GH release
Tachyphylaxis#
With repeated administration, a partial decrease in GH response (tachyphylaxis) is observed. Studies examining multiple daily doses or prolonged treatment periods have shown:
- Acute GH response decreases by approximately 30-50% after several days of repeated dosing
- Significant GH-releasing activity is maintained despite partial desensitization
- The degree of tachyphylaxis varies between studies and may depend on dosing frequency
- Intermittent dosing schedules (e.g., 5 days on / 2 days off) have been proposed to minimize desensitization
Combination Protocols#
GHRP-6 + GHRH#
The combination of GHRP-6 with a GHRH analog produces synergistic GH release:
- GHRP-6 alone (1 mcg/kg): GH peak approximately 20-40 ng/mL
- GHRH alone (1 mcg/kg): GH peak approximately 10-25 ng/mL
- GHRP-6 + GHRH (each 1 mcg/kg): GH peak approximately 60-120 ng/mL
This synergism exceeds simple additivity by 2-3 fold and reflects the complementary mechanisms of action. The combination has been proposed as the most sensitive provocative test for GH deficiency.
Administration Best Practices (Research Context)#
- Fasting state: Administer at least 30 minutes before meals for optimal GH response
- Blood glucose: Avoid administration during hyperglycemia, which attenuates GH release
- Exercise: Vigorous exercise prior to administration may confound GH measurements
- Sleep timing: Evening administration may coincide with natural GH pulsatility
- Injection technique: Standard subcutaneous injection technique with rotation of sites
Storage and Handling#
Proper storage is essential for maintaining peptide integrity:
- Lyophilized powder: Store at -20 degrees C or below; stable for extended periods
- Reconstituted solution: Refrigerate at 2-8 degrees C; use within 2-4 weeks
- Avoid: Repeated freeze-thaw cycles, exposure to light, contamination from non-sterile technique
- Reconstitution: Use bacteriostatic water (for multi-use) or sterile water (for single use); gentle swirling to dissolve
Related Reading#
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Frequently Asked Questions About GHRP-6
What is the recommended dose of GHRP-6?
Research protocols for GHRP-6 typically use 1 mcg/kg administered Single IV bolus for Acute diagnostic test. Used as a provocative test for GH deficiency assessment. Alternative protocols may use different doses depending on the research objective. No FDA-approved human dosing exists.
How is GHRP-6 administered?
GHRP-6 is typically administered via the following routes: Subcutaneous (abdomen, deltoid region), Intravenous (clinical research settings), Intranasal (research, lower bioavailability). The choice of administration site may depend on the research protocol and study objectives. Always follow established research protocols.
How should GHRP-6 be reconstituted?
Lyophilized GHRP-6 is typically reconstituted with bacteriostatic water or sterile water for injection. Research-grade vials (commonly 5 mg) are reconstituted to desired concentration. Gentle swirling rather than vigorous shaking is recommended.
How should GHRP-6 be stored?
Lyophilized GHRP-6 should be stored at -20 degrees C or below for long-term storage. Reconstituted solutions should be refrigerated at 2-8 degrees C and used within 2-4 weeks. Protect from light and repeated freeze-thaw cycles.
How long is a typical GHRP-6 cycle?
Typical research protocols for GHRP-6 use a cycle duration of 8-12 weeks, then 2-4 weeks off. An off-period of 4 weeks is sometimes incorporated between cycles. Cycles may be repeated based on research objectives.
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Medical Disclaimer
This website is for educational and informational purposes only. The information provided is not intended to diagnose, treat, cure, or prevent any disease. Always consult with a qualified healthcare professional before using any peptide or supplement.