How Chorionic Gonadotropin Works in Men
Chorionic gonadotropin (hCG) mimics luteinizing hormone (LH), stimulating Leydig cells in the testes to produce testosterone. This boosts spermatogenesis, the process of sperm production.[1] Doctors prescribe hCG for men with hypogonadotropic hypogonadism, where low LH/FSH levels impair fertility.
Does hCG Improve Male Fertility?
Yes, hCG increases fertility in men with specific deficiencies. Clinical studies show it raises testosterone and sperm count in infertile men due to secondary hypogonadism. For example, combined hCG and FSH therapy induces sperm production in 75-90% of azoospermic patients with hypothalamic-pituitary issues.[2][3] It's FDA-approved for this under brands like Pregnyl and Novarel.
When Is hCG Used for Fertility?
- Hypogonadism treatment: Restores testosterone and sperm output.
- With testosterone replacement: hCG prevents testicular shrinkage and maintains sperm production suppressed by exogenous testosterone.[4]
- Assisted reproduction: Part of protocols for oligozoospermia or post-vasectomy recovery.
Dosing typically starts at 1,500-5,000 IU 2-3 times weekly, monitored via semen analysis and hormone levels.
What Are the Limits and Risks?
hCG doesn't help primary testicular failure (e.g., Klinefelter syndrome), where sperm production is genetically impaired.[5] Side effects include gynecomastia, acne, and fluid retention; overstimulation risks multiple pregnancies in donor scenarios. Long-term use requires fertility specialist oversight to avoid desensitization.
How Does hCG Compare to Alternatives?
Unlike clomiphene (which boosts endogenous LH/FSH), hCG provides direct stimulation but needs injections. FSH analogs like Gonal-F pair with hCG for better results in severe cases. Testosterone monotherapy harms fertility; hCG counters this.[6]
[1] FDA Label: Human Chorionic Gonadotropin
[2] Liu et al., J Clin Endocrinol Metab (2002)
[3] European Association of Urology Guidelines
[4] Coviello et al., J Clin Endocrinol Metab (2005)
[5] Practice Committee of ASRM (2018)
[6] DrugPatentWatch.com - hCG Patents