What is GHRP-6?
GHRP-6 (Growth Hormone Releasing Peptide-6) is a synthetic hexapeptide that strongly stimulates growth hormone release through the ghrelin receptor (GHS-R1a). It was one of the first GHRPs developed and is known for its potent appetite-stimulating effects alongside GH release.
GHRP-6 creates a significant increase in hunger, which can be beneficial or undesirable depending on research goals. This appetite effect is stronger than GHRP-2 and much stronger than Ipamorelin.
The 5mg vial provides multiple weeks of research depending on protocol.
Quick Reference
| Parameter | Value |
|---|---|
| Peptide Amount | 5mg |
| Recommended BAC Water | 2mL |
| Resulting Concentration | 2.5mg/mL (2500mcg/mL) |
| Typical Research Dose | 100-300mcg |
| Frequency | 2-3x daily |
| Research Duration | 8-12 weeks |
GHRP-6 Characteristics
| Effect | Level | Notes |
|---|---|---|
| GH Release | Strong | Comparable to GHRP-2 |
| Appetite | Very Strong | Significant hunger increase |
| Cortisol | Mild increase | Less than Hexarelin |
| Prolactin | Mild increase | Minimal at normal doses |
Reconstitution Guide
Materials Needed
- GHRP-6 5mg lyophilized vial
- Bacteriostatic water (BAC water)
- Insulin syringes (U-100, 29-31 gauge)
- Alcohol swabs
- Sharps container
Step-by-Step Instructions
-
Prepare workspace — Clean area, wash hands.
-
Clean vial stoppers — Wipe with alcohol swabs.
-
Draw BAC water — Draw 2mL of bacteriostatic water.
-
Add to peptide vial — Inject slowly down the inside wall.
-
Dissolve — GHRP-6 dissolves quickly, 1-3 minutes.
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Verify — Solution should be clear and colorless.
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Label and refrigerate — Store immediately.
Alternative Reconstitution
| BAC Water | Concentration | Best For |
|---|---|---|
| 2mL | 2.5mg/mL | Standard |
| 2.5mL | 2mg/mL | Easy math |
| 5mL | 1mg/mL | Precise measuring |
Dosage Protocol
Concentration Calculations
With 5mg peptide in 2mL BAC water:
- Concentration: 2.5mg/mL = 2500mcg/mL
- Per unit (U-100 syringe): 25mcg per unit
Common Dose Calculations
| Desired Dose | Draw Volume | Syringe Units |
|---|---|---|
| 100mcg | 0.04mL | 4 units |
| 150mcg | 0.06mL | 6 units |
| 200mcg | 0.08mL | 8 units |
| 300mcg | 0.12mL | 12 units |
Doses Per Vial
At 2.5mg/mL concentration (2mL total = 5mg):
| Protocol | Dose | Injections | Duration |
|---|---|---|---|
| 100mcg 2x/day | 100mcg | 50 | 25 days |
| 100mcg 3x/day | 100mcg | 50 | ~17 days |
| 200mcg 2x/day | 200mcg | 25 | ~12 days |
Suggested Research Protocols
Protocol A: Standard
- Dose: 100-150mcg
- Frequency: 2-3x daily
- Duration: 8-12 weeks
Protocol B: With GHRH
- GHRP-6: 100-200mcg
- CJC-1295: 100mcg
- Frequency: 2-3x daily together
- Duration: 8-12 weeks
Protocol C: Appetite Research
- Dose: 200-300mcg
- Frequency: 2-3x daily
- Focus: Studying appetite/caloric intake effects
Timing Considerations
Optimal timing:
- Morning (fasted)
- Post-workout
- Before bed
The Appetite Effect:
- Hunger typically peaks 20-30 minutes post-injection
- Lasts approximately 30-60 minutes
- More pronounced at higher doses
- Planning meals around this can be helpful
Injection Guide
Subcutaneous Administration
- Clean injection site with alcohol swab
- Pinch skin fold at abdomen or thigh
- Insert needle at 45-90° angle
- Inject slowly
- Wait 5 seconds, withdraw
Site Rotation
Rotate between multiple sites for 2-3x daily dosing.
Storage Requirements
Lyophilized
- Temperature: -20°C or colder
- Duration: 2+ years
Reconstituted
- Temperature: 2-8°C
- Duration: 3-4 weeks
Research Considerations
Mechanism of Action
GHRP-6 works through:
- Ghrelin receptor activation — GHS-R1a binding
- Direct pituitary stimulation — Somatotroph activation
- Appetite pathway activation — Strong orexigenic effect
- GH pulse creation — Significant release
GHRP-6 vs Other GHRPs
| Factor | GHRP-6 | GHRP-2 | Ipamorelin |
|---|---|---|---|
| GH release | +++ | ++++ | +++ |
| Appetite | +++ | + | Minimal |
| Cortisol | + | + | Minimal |
| Best use | With appetite goals | Balanced | Clean GH |
When to Choose GHRP-6
Good choice when:
- Appetite stimulation is desired
- Researching hunger mechanisms
- Caloric surplus goals
- Cost is a primary factor (often cheapest GHRP)
Consider alternatives when:
- Appetite increase is unwanted
- Cleaner hormone profile preferred
- Dieting/caloric restriction protocols
Stacking Options
GHRP-6 + CJC-1295 (no DAC)
- Standard GHRH+GHRP synergy
- Enhanced GH release
GHRP-6 + GHRP-2
- Generally not recommended
- Redundant mechanism
- Choose one or the other
Sourcing for Research
Source from verified suppliers that provide third-party testing and certificates of analysis (COA) for each batch. Compare purity documentation, shipping conditions, and batch traceability before purchasing research materials.
Scientific References
- Bowers CY, et al. “On the Actions of the Growth Hormone-Releasing Hexapeptide, GHRP.” Endocrinology. 1991;128(4):2027-2035.
- Arvat E, et al. “Preliminary Evidence for an Effect of Hexarelin on Appetite in Humans.” J Endocrinol Invest. 1998;21(5):313-318.
Last updated: December 23, 2025
Disclaimer: This information is for educational and research purposes only. GHRP-6 is a research peptide not intended for human consumption.