Gonadorelin (compounded)
GnRH (native)
Also Compounded gonadorelin, GnRH, Gonadotropin-releasing hormone, LHRH, Factrel, Lutrepulse
- Evidence
- CAnimal and cell studies
- FDA status
- Not approvedas of 2026-10-26
- Route
- Injection
- Studies cited
- 1 human0 animal or cell
A pharmacy-made injection that clinics give men on testosterone to keep the testicles from shrinking. No trial has tested it for that.
Sold for
Compounded gonadorelin is sold by men's-health clinics as an injection taken alongside testosterone to prevent testicular shrinkage and preserve fertility, a role hCG used to fill.
Studies say
Pulsatile GnRH works in men whose pituitary is intact but unstimulated, but no trial has tested intermittent gonadorelin injections in men on testosterone therapy, so the grade is C.
Why grade C. For the use it is compounded for, keeping testicular size and fertility during testosterone replacement, there are no controlled trials. The human evidence in the citations is a meta-analysis of seven studies (420 men) of pulsatile GnRH pumps in congenital hypogonadotropic hypogonadism, a different condition treated with a different delivery method. 1
FDA. Gonadorelin was once sold as the FDA-approved products Factrel (a diagnostic) and Lutrepulse (a pump-delivered fertility treatment), both now discontinued in the United States, and no FDA-approved gonadorelin product is marketed as of 2026-10-26. The gonadorelin used alongside testosterone therapy is compounded and has no approved indication for that use. 3
Written from 3 cited sources. Last refreshed 2026-10-27. Not physician reviewed.
What this means for you
- What people take it for
- Keeping testicle size and fertility during testosterone treatment.
- Can a US doctor prescribe it?
- No. The approved gonadorelin products are discontinued, and the version used here is made up by a pharmacy.
- Properly tested in people?
- Not properly: animal or lab studies, or small uncontrolled human reports. The only data are a review of seven studies (420 men) on a different condition.
Evidence checklist
- Randomised controlled trial No trial in men on testosterone therapyno
- Human study over 100 people Meta-analysis of 420 men, different conditionyes
- More than one research group Evidence is pooled studies of pump deliveryno information
- Clinical outcomes, not surrogate markers Testicular volume, sperm, pregnancy in CHHyes
- Human safety data beyond case reports Allergic reactions seen; injection untestedno
Drawn from the cited studies below. A dash means the sources give no information.
What it is
Gonadorelin is lab-made gonadotropin-releasing hormone (GnRH). It is a peptide with ten amino acids. The brain's hypothalamus releases it in pulses. This makes the pituitary secrete LH and FSH. The lab-made version is identical to the natural hormone. Blood clears it within minutes. 2
Compounding pharmacies, including 503B outsourcing facilities, supply gonadorelin shots to clinics. These clinics give it with testosterone. Demand rose after 2023. That year the FDA limited compounding of hCG, the drug clinics had used for the same goal. 3
How it works
Testosterone replacement switches off the body's own GnRH, LH and FSH. The testes then stop making testosterone and sperm, and they shrink. The idea behind compounded gonadorelin is to replace the missing GnRH signal. The pituitary would then keep releasing LH and FSH. This is hard. GnRH only works when it comes in pulses roughly every 90 to 120 minutes. That is why the approved fertility product used a programmable pump. Steady or rare doses make the receptor stop responding. No one has tested if one or two shots a day can copy the pulse pattern. 21
What human research shows
The only human data cited are in men with congenital hypogonadotropic hypogonadism, who lack GnRH from birth. A 2021 meta-analysis of seven studies (420 men) compared pulsed GnRH from a pump with gonadotropin injections. The pump gave larger testicle size. Sperm appeared about five months earlier. Rates of sperm detection, sperm concentration and partner pregnancy were no different. Allergic reactions were more common with GnRH. 1
No trial has studied gonadorelin shots in men taking outside testosterone. No trial has compared it with hCG for that goal. 13
| Study | Model | Finding |
|---|---|---|
| Pulsatile GnRH vs gonadotropins meta-analysis | Humans, 7 studies, n=420 men with congenital hypogonadotropic hypogonadism | Larger testicular volume and earlier spermatogenesis with pulsatile GnRH; no difference in sperm counts or pregnancy rate. 1 |
| Pulsatile GnRH in hypogonadotropic hypogonadism | Humans, clinical series using programmable pumps | Pulse delivery restores LH and FSH secretion when the pituitary is intact. 2 |
Safety
In the pulsed GnRH studies, the main side effects were allergic reactions at the infusion site. Gonadorelin is a natural hormone with a short half-life. So harm to the body is not expected at normal doses. Some things are unknown. One is whether shots without pulses suppress the pituitary over time instead of stimulating it. Another is the quality and sterility of compounded product. This varies by pharmacy. 13
Questions for your clinician
- Is there any controlled human trial for the use I have in mind with testosterone therapy?
- How does gonadorelin compare with hCG for preserving fertility?
- How is the compounding pharmacy's product tested for sterility and purity?
Questions people ask
Is compounded gonadorelin FDA-approved?
No. The approved gonadorelin products were discontinued. Compounded versions are made without an approved use. Using it with testosterone therapy is off-label by definition, because there is no label. 3
Does gonadorelin replace hCG for men on testosterone?
That is the intent, but no trial has compared them in this setting. hCG acts directly on the testes. Gonadorelin acts on the pituitary and depends on pulsed delivery, which daily shots may not copy. 12
What does the research actually show?
In men born without GnRH, pulsed GnRH from a pump restores sperm production. It does so a little faster than gonadotropin injections, based on 420 men across seven studies. There is no equal evidence for men on testosterone. 1
Citations
- 2021, World J Mens Health: pulsatile GnRH versus gonadotropin therapy in congenital hypogonadotropic hypogonadism, meta-analysis pubmed.ncbi.nlm.nih.gov
- Horm Res: pulsatile GnRH therapy in hypogonadotropic hypogonadism doi.org
- Drugs.com: gonadorelin (Factrel), discontinued in the US drugs.com