HMG
Educational information only — not medical advice. Many listed compounds are not FDA-approved for human use. Consult a licensed clinician before starting, changing, or stopping any protocol.
Overview
HMG (Human Menopausal Gonadotropin), also known as menotropins, is an injectable fertility hormone that contains both follicle-stimulating hormone (FSH) and luteinizing hormone (LH). Early preparations combined the two in roughly a 1:1 ratio, and the medication is traditionally purified from the urine of postmenopausal women.
It is one of the longer-established gonadotropin therapies, with clinical use dating back to the 1960s. In women, it is FDA-approved to stimulate the development of ovarian follicles as part of assisted reproductive technology. In men, it is used off-label — most often in the setting of fertility care — to help drive the testicular signaling involved in sperm production.
Because testosterone replacement therapy can suppress the body’s own gonadotropin output and reduce fertility, HMG is commonly discussed as part of protocols aimed at preserving or restoring spermatogenesis, sometimes alongside hCG.
How it works
The two components of HMG act on different targets. The LH component stimulates the testes (or the ovarian theca cells in women) to produce androgens such as testosterone, while the FSH component supports the cells responsible for maturing sperm in men and follicles in women. Together they reproduce the two key hormonal signals the pituitary would normally send.
In men on testosterone therapy, exogenous testosterone suppresses natural FSH and LH, which can shut down sperm production over time. Supplying gonadotropin activity directly is the rationale behind using HMG (often with hCG) to keep the testes active. Reported success at restoring sperm production in the published male-fertility literature varies widely between individuals.
Reported benefits
- Studied for maintaining or restoring sperm production in men on testosterone therapy (off-label)
- Provides both FSH and LH activity, unlike hCG alone
- FDA-approved and widely used for follicle development in assisted reproduction (in women)
- Reported in reviews as an effective, established option for gonadotropin therapy
These are reported and studied effects, not guaranteed outcomes, and individual response varies.
Considerations & side effects
As an injectable hormone that alters reproductive signaling, HMG should be used under the supervision of a qualified clinician, and its use in men for fertility is off-label. Commonly reported side effects include injection-site reactions, headache, abdominal or pelvic discomfort, and bloating; in fertility settings, overstimulation is a recognized risk that requires medical monitoring.
Response to gonadotropin therapy is highly individual and can take many months to become apparent, and the published male-fertility data reflects a range of outcomes. HMG is not a substitute for evaluation and treatment by a qualified clinician.
Frequently asked
What is HMG?
Human Menopausal Gonadotropin (HMG), also called menotropins, is an injectable fertility hormone that combines follicle-stimulating hormone (FSH) and luteinizing hormone (LH), historically in a roughly 1:1 ratio.
Is HMG FDA-approved?
Yes, as a fertility medication. Menotropins (sold under brand names such as Menopur) are FDA-approved to help develop multiple follicles in women undergoing assisted reproductive technology. Using it in men to support sperm production is off-label.
Why is HMG discussed alongside TRT?
Testosterone replacement therapy suppresses the body's own signaling to the testes, which can reduce sperm production. Gonadotropins like HMG are studied as a way to help maintain spermatogenesis in men who want to preserve fertility.
How is HMG different from hCG?
hCG mainly mimics LH to stimulate testosterone production, while HMG supplies both LH and FSH activity. FSH acts more directly on the cells that support sperm development, which is why the two are sometimes combined.
References
Related compounds
Synthetic gonadotropin-releasing hormone (GnRH) that stimulates pituitary release of FSH and LH. Used alongside TRT to maintain testicular function and natural hormone production. Common alternative to HCG.
Neuropeptide that stimulates GnRH release, triggering natural testosterone and reproductive hormone production. Used for hormonal assessment and reproductive health support.
Naturally occurring hormone involved in social bonding, mood regulation, and reproductive function. Administered as nasal spray for anxiolytic and social benefits.