What is Gonadorelin?
Gonadorelin is synthetic gonadotropin-releasing hormone (GnRH), also known as LHRH (luteinizing-hormone-releasing hormone). It is a decapeptide with the native sequence Glp-His-Trp-Ser-Tyr-Gly-Leu-Arg-Pro-Gly-NH2 and a molecular weight of approximately 1182. It is also encountered as Gonadorelin acetate and under the historic brand names Factrel and Lutrelef/Lutrepulse.
Gonadorelin binds GnRH receptors in the anterior pituitary and stimulates the release of luteinizing hormone (LH) and follicle-stimulating hormone (FSH). These gonadotropins in turn drive gonadal production of testosterone and estrogen and support gametogenesis. Unlike long-acting analogues such as leuprolide, gonadorelin is a native-sequence agonist — it reproduces the body’s own hormone rather than a modified version.
Pulsatility is essential to how gonadorelin works. Physiological, pulsatile exposure stimulates the reproductive axis, whereas continuous or high-frequency exposure downregulates (desensitizes) GnRH receptors and suppresses gonadotropin output. This is the central pharmacological fact that shapes every dosing decision below.
The 2mg vial suits shorter research windows or lower-total-quantity protocols.
Quick Reference
| Parameter | Value |
|---|---|
| Peptide Amount | 2mg |
| Recommended BAC Water | 2mL |
| Resulting Concentration | 1mg/mL (1000mcg/mL) |
| Diagnostic Reference Dose | 100mcg (single, clinical) |
| Community TRT-Adjunct Dose | 100-200mcg (community-reported) |
| Frequency | 2-3x weekly (community) |
Reconstitution Guide
Materials Needed
- Gonadorelin 2mg lyophilized vial
- Bacteriostatic water (BAC water)
- Insulin syringes (U-100, 29-31 gauge)
- Alcohol swabs
- Sharps container
Step-by-Step Instructions
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Prepare your workspace — Clean your work area and gather all materials. Wash hands thoroughly.
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Clean the vial stoppers — Wipe the Gonadorelin vial stopper and BAC water vial with alcohol swabs. Allow to dry.
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Draw the BAC water — Using a sterile syringe, draw 2mL of bacteriostatic water.
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Add water to peptide vial — Insert the needle and slowly inject BAC water down the inside wall of the vial. Never spray directly onto the powder.
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Allow to dissolve — Gonadorelin dissolves quickly, usually within 1-2 minutes. Gently swirl if needed — never shake.
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Verify dissolution — Solution should be clear and colorless. Discard if cloudy or particles visible.
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Label and store — Write reconstitution date on vial. Refrigerate immediately.
Alternative Reconstitution Options
| BAC Water | Concentration | Best For |
|---|---|---|
| 1mL | 2mg/mL | Concentrated, smaller draw volumes |
| 2mL | 1mg/mL | Standard concentration |
| 4mL | 0.5mg/mL | Very precise low-dose measurements |
Dosage Protocol
Clinical vs. community doses: The established clinical diagnostic dose is a single 100mcg injection used to test pituitary gonadotropin reserve. Separately, community/off-label use as a TRT adjunct reports 100-200mcg given 2-3x weekly to help maintain testicular function. The community regimen is not an approved use and is reported here for research context only.
Concentration Calculations
With 2mg peptide in 2mL BAC water:
- Concentration: 1mg/mL = 1000mcg/mL
- Per unit (U-100 syringe): 10mcg per unit
Common Dose Calculations
| Desired Dose | Draw Volume | Syringe Units |
|---|---|---|
| 50mcg | 0.05mL | 5 units |
| 100mcg | 0.10mL | 10 units |
| 150mcg | 0.15mL | 15 units |
| 200mcg | 0.20mL | 20 units |
| 250mcg | 0.25mL | 25 units |
Doses Per Vial
At 1mg/mL concentration (2mL total = 2mg):
| Dose per Injection | Doses Per Vial | Duration (2-3x/week) |
|---|---|---|
| 100mcg | 20 doses | ~7-10 weeks |
| 150mcg | ~13 doses | ~4-6 weeks |
| 200mcg | 10 doses | ~3-5 weeks |
Stability caveat: Reconstituted gonadorelin should be used within roughly 2-4 weeks (see Storage). If a vial provides more weeks of doses than that window, the solution may expire before the vial is finished.
Suggested Research Protocols
Protocol A: Diagnostic Reference (clinical)
- Dose: 100mcg
- Frequency: Single administration
- Purpose: Pituitary gonadotropin-reserve testing
Protocol B: TRT-Adjunct Pattern (community-reported)
- Dose: 100mcg
- Frequency: 2-3x weekly
- Note: Intended to mimic more frequent stimulation of the axis
Protocol C: Higher-Frequency Community Pattern
- Dose: 100-200mcg
- Frequency: Every other day
- Caution: More frequent/continuous exposure risks GnRH-receptor desensitization
Injection Guide
Subcutaneous Administration (Most Common)
- Clean injection site with alcohol swab
- Pinch skin fold at abdomen
- Insert needle at 45-90° angle
- Inject slowly
- Wait 5 seconds before withdrawing
- Apply gentle pressure — do not massage
Site Selection
- Abdomen (rotate sites)
- Subcutaneous fat areas
Timing Considerations
- Because gonadorelin’s half-life is very short, pulsatile timing is central to its physiology
- Continuous or excessively frequent exposure desensitizes GnRH receptors and can suppress the very gonadotropins the peptide is meant to stimulate
- Consistent timing recommended for research protocols
Storage Requirements
Lyophilized (Powder Form)
- Temperature: -20°C (-4°F) or colder
- Duration: Long-term (relatively stable in lyophilized form)
- Conditions: Protect from light and moisture
Reconstituted (Mixed with BAC Water)
- Temperature: 2-8°C (36-46°F)
- Duration: Use within ~2-4 weeks
- Conditions: Protect from light, never freeze
Stability Notes
- Gonadorelin is relatively labile in solution — its in-use window is shorter than BPC-type peptides
- Solution should remain clear throughout use
- Discard if any cloudiness or particles develop
Research Considerations
Mechanism of Action
Gonadorelin’s effects follow directly from GnRH physiology:
- GnRH receptor binding: Activates pituitary gonadotroph cells
- LH release: Drives gonadal steroidogenesis (testosterone/estrogen)
- FSH release: Supports gametogenesis
- Pulsatile dependence: Stimulatory when delivered in pulses; suppressive when continuous
- Native agonist: Reproduces the endogenous hormone rather than a long-acting analogue
Key Research Areas
Established and studied uses of gonadorelin include:
- Diagnostic testing of pituitary gonadotropin reserve
- Pulsatile-pump treatment of hypothalamic amenorrhea
- Hypogonadotropic hypogonadism and associated infertility
- Off-label/community interest as a TRT adjunct (an hCG alternative) to maintain testicular function — not an approved use
Pharmacokinetics
Gonadorelin has real human PK data and a notably short half-life: plasma distribution half-life of roughly 2-10 minutes and a terminal half-life of about 10-40 minutes. This brevity is precisely why frequent or pulsatile dosing is required to sustain an effect.
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
- DrugBank. “Gonadorelin (DB00644).” https://go.drugbank.com/drugs/DB00644
- Handelsman DJ, Swerdloff RS. “Pharmacokinetics of gonadotropin-releasing hormone and its analogs.” Endocr Rev. 1986;7(1):95-105.
Last updated: July 15, 2026
Disclaimer: This information is for educational and research purposes only. Gonadorelin is a research peptide not intended for human consumption. Always follow applicable laws and institutional guidelines.