GHRP-6: Dosing Protocols
Dosing guidelines, reconstitution, and administration information
๐TL;DR
- โข4 dosing protocols documented
- โขReconstitution instructions included
- โขStorage: 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
โ 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.
โ๏ธ 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
๐ก Key Considerations
- โIntermittent dosing (5 days on / 2 days off) may reduce desensitization
- โContraindication: 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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๐Reconstitution 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
- โSubcutaneous (abdomen, deltoid region)
- โIntravenous (clinical research settings)
- โIntranasal (research, lower bioavailability)
๐งStorage 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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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.