In plain English
Gonadorelin is identical to GnRH, the hormone the brain releases in pulses to tell the pituitary to make LH and FSH. Those two hormones then drive testosterone, sperm and ovulation. Short pulses stimulate this system; constant exposure shuts it down.
What it's used for
- Supporting natural testosterone and fertility on TRT
- Testing pituitary function
- Restarting hormones after a cycle
Benefits
In human studies, pulsed gonadorelin restored LH, FSH and fertility in people whose brain did not make enough GnRH. Users on TRT report it helps keep testicular size, though results are mixed compared with HCG.
How it works
In simple terms: it gives the pituitary the “release LH and FSH” signal.
It binds GnRH receptors on the pituitary, causing a burst of LH and FSH. Because it lasts only minutes, it mimics natural pulses. Continuous dosing has the opposite effect and shuts the axis down.
Development history
- 1971: GnRH structure identified by Andrew Schally and Roger Guillemin, leading to the 1977 Nobel Prize.
- 1980s: Approved as a diagnostic test (Factrel), since discontinued.
Typical protocols
These ranges are what clinics and users commonly report.
| Use | Dose | Frequency |
|---|---|---|
| On TRT | 100–200 mcg | 2–3 times a week, or daily |
Cycling
Used continuously alongside TRT, in short pulses.
Administration options
Subcutaneous injection.
Reconstitution and dosing calculator
Usually comes in 2 mg or 5 mg vials, mixed with 2 mL of bacteriostatic water.
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This tool does arithmetic only. It does not choose a dose or confirm that any substance is right for you. Double-check every result against your syringe and your clinician’s instructions.
Side effects and safety
- Headache, flushing and injection-site reactions.
- Too-frequent dosing can suppress hormones instead of stimulating them.
- Avoid during pregnancy and breastfeeding unless prescribed.
Common stacks
- Testosterone: as part of TRT.
- Kisspeptin: acts one step higher.
Storage
Powder: refrigerate. After mixing: refrigerate at 2–8 °C and use within about 3–4 weeks.
Compare with
- HCG: acts directly on the testicles and is more reliable.
- Triptorelin: a long-acting GnRH analog used for a single "restart" dose or for suppression.
Frequently asked questions
Why so many doses a week?
It lasts only minutes, so it is dosed often to mimic the brain’s natural pulses.
References
- Crowley WF, McArthur JW. Simulation of the normal menstrual cycle in Kallman's syndrome by pulsatile administration of luteinizing hormone-releasing hormone (LHRH). J Clin Endocrinol Metab. 1980;51(1):173-175.