Men's Health · LH analog · Compounded 503A
HCG: the LH-mimetic that keeps your testes online.
Human chorionic gonadotropin (HCG) is a placental glycoprotein hormone that mimics luteinizing hormone (LH) at the testicular Leydig cell. In men's health it is the cornerstone of fertility-preserving TRT protocols — keeping the testes producing testosterone and sperm even when exogenous testosterone suppresses the brain's signal.
What HCG is
HCG is a glycoprotein hormone naturally produced by the placenta during pregnancy. It shares the same alpha subunit as LH, FSH, and TSH, and a beta subunit nearly identical to LH — which is why it binds and activates the LH receptor.
In men's health, HCG is used to mimic the brain's LH signal. When TRT suppresses pituitary LH and FSH (the universal consequence of exogenous testosterone), the testes shrink and stop producing sperm. HCG bypasses the suppression by directly stimulating the testes.
It is also used in pediatric endocrinology for undescended testicles and in fertility medicine for ovulation induction and as an LH-surge trigger in IVF cycles.
How it works
HCG binds the LH/CG receptor on testicular Leydig cells, activating adenylate cyclase and downstream steroidogenesis enzymes — driving testosterone production from cholesterol via pregnenolone.
It also supports Sertoli cells (through the high intratesticular testosterone it produces), which sustains spermatogenesis. This is why HCG preserves fertility during TRT in a way that exogenous testosterone alone cannot.
Half-life is ~24 hours, allowing 2–3x weekly dosing to maintain steady stimulation.
What patients use it for
Preserves testicular volume during TRT
Maintains Leydig and Sertoli cell activity so testes don't atrophy on exogenous testosterone.
Preserves fertility during TRT
Keeps intratesticular testosterone high enough for spermatogenesis to continue — the only TRT add-on with robust evidence for this.
Restart protocols
Used (often with clomiphene or enclomiphene) to restart endogenous testosterone after TRT discontinuation.
Hypogonadotropic hypogonadism
First-line treatment for men whose hypogonadism is driven by pituitary-axis failure rather than testicular failure.
Evidence summary
Coviello AD et al. (JCEM, 2005) demonstrated HCG preserves intratesticular testosterone during exogenous testosterone administration.
Hsieh TC et al. (J Urol, 2013) showed concomitant HCG with TRT maintains semen parameters in men of reproductive age.
Liu PY et al. (Lancet, 2006) systematic review of gonadotropin therapy in hypogonadotropic hypogonadism.
Dosing and clinical context
General clinical context only. Kindr Health physicians determine the appropriate dose and protocol for each patient based on history and labs. This is not a prescription or dosing recommendation.
Subcutaneous or IM injection, typically 2–3x per week when paired with TRT (lower doses) or higher doses for fertility induction.
Often co-prescribed with TRT from the start in men of reproductive age who wish to preserve fertility.
Compounded by licensed 503A pharmacies (brand-name HCG availability has been intermittent).
Safety and contraindications
Generally well tolerated. Possible: injection-site reactions, breast tenderness or gynecomastia (HCG can aromatize via the testicular pathway), mood changes.
Contraindications: prostate or breast cancer, hormone-sensitive tumors, premature puberty.
Periodic estradiol monitoring is appropriate — some patients need an aromatase inhibitor adjunct.
Not FDA-approved for low-T in adult males; FDA-approved for hypogonadotropic hypogonadism and select fertility indications.
Who it's typically considered for
- Men starting TRT who wish to preserve fertility or testicular volume
- Men with hypogonadotropic (secondary) hypogonadism
- Men attempting to restart endogenous testosterone after stopping TRT
- Men with TRT-induced testicular atrophy seeking restoration
Frequently asked questions
Is HCG a peptide?
Technically a glycoprotein hormone — larger than typical peptides, with sugar moieties — but functionally similar and included in our men's-health catalog because of its compounded-pharmacy pathway.
Do I need HCG with TRT?
Strongly recommended for any man of reproductive age — TRT suppresses LH and FSH within weeks, causing testicular atrophy and (usually) infertility. HCG prevents both.
HCG vs enclomiphene?
Different mechanisms. HCG directly stimulates the testes (downstream). Enclomiphene blocks pituitary estrogen feedback, raising endogenous LH and FSH (upstream). Some protocols use both.
Will HCG raise estrogen?
Possibly — testicular testosterone produced under HCG can aromatize to estradiol. Periodic labs guide whether an aromatase inhibitor is needed.
Is HCG the same as the diet protocol?
No — the 'HCG diet' is not supported by evidence and is not what men's-health prescribing uses HCG for. Men's-health HCG is for testicular and fertility support, not weight loss.
Will I need HCG forever on TRT?
If you stay on TRT and want to preserve fertility / testicular volume, yes. If you stop TRT, HCG is used as part of a 'restart' protocol then tapered.
Sources
- Coviello AD et al. Low-dose hCG maintains intratesticular testosterone in normal men with TRT-induced gonadotropin suppression. JCEM (2005). — pubmed.ncbi.nlm.nih.gov/15572415
- Hsieh TC et al. Concomitant intramuscular hCG preserves spermatogenesis in men undergoing TRT. J Urol (2013). — pubmed.ncbi.nlm.nih.gov/23274405
- Liu PY et al. Induction of spermatogenesis and fertility during gonadotropin treatment of gonadotropin-deficient infertile men. Lancet (2006). — pubmed.ncbi.nlm.nih.gov/16753485
Considering HCG?
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Medically reviewed by Dr. Ana Lisa Carr, MD, MBA
Board-Certified Family Medicine Physician · Lead Provider / Medical Reviewer
NPI 1689841744 · Last reviewed: May 10, 2026
Last reviewed May 10, 2026. Compounded medications are prepared by FDA-registered 503A pharmacies and are not FDA-approved drug products. Prescriptions require a clinical evaluation; a Kindr Health physician determines eligibility. Not for use in pregnancy. This page provides educational information and is not medical advice.