HCG (Human Chorionic Gonadotropin)

Human chorionic gonadotropin

HCG mimics luteinizing hormone, directly stimulating the testes to produce testosterone and maintain sperm production. Most commonly used alongside TRT to preserve testicular function and fertility — or as a monotherapy fertility restart.

Gonadotropin / LH analoguePrescription requiredEvidence B
⚠ Not medical advice.Not medical advice. This page is educational. Discuss with your physician before starting, changing, or stopping any medication.

Why it matters

HCG fills a specific gap that TRT alone cannot: it keeps the testicles active. Standard TRT suppresses LH, causing testicular atrophy and infertility in over 90% of users. Low-dose HCG (typically 250–500 IU 2–3 times weekly) replaces the LH signal, restoring intratesticular testosterone — which is roughly 50–100x higher than serum levels and essential for spermatogenesis. Coviello's 2005 work demonstrated that even modest HCG doses preserve sperm production in men on TRT-suppressed gonadotropins. For men who want TRT's benefits without sacrificing fertility, HCG is the standard adjunct. It is also a core component of post-cycle therapy and fertility restart protocols after anabolic use. The evidence base is moderate (B-grade): the mechanism is well-established, observational and small-trial data support efficacy, but large RCTs are lacking. HCG is not a stand-alone TRT — total testosterone gains on HCG monotherapy are modest and inconsistent. It is a partner medication, not a replacement.

Uses

Label uses (approved)
  • Hypogonadotropic hypogonadism
  • Cryptorchidism in prepubertal boys
  • Ovulation induction in women

Dosing

Label dose
1,000–4,000 IU IM 2–3 times per week (varies widely by indication)
Off-label / biohacker dose
250–500 IU SC 2–3 times per week alongside TRT; or 1,500–3,000 IU 2x/week for fertility restart
Titration: TRT-adjunct dosing is low (250–500 IU). Doses above 1,000 IU/dose more often drive aromatization and side effects without adding benefit.
When to take: Same time of day, typically morning or pre-workout; subcutaneous injection

Side effects & warnings

Common
  • Injection-site irritation
  • Acne
  • Mild gynecomastia (via increased estradiol)
  • Mood swings
  • Headache
Uncommon but serious
  • Increased estradiol
  • Water retention
  • Testicular sensitivity
Serious warnings
Risk of ovarian hyperstimulation syndrome in women (not relevant to male use). In men, supraphysiologic doses can cause Leydig cell desensitization over time. Counterfeit/unregulated HCG from gray-market sources is a real risk.

Biomarkers affected

estradiol
increase
Increases intratesticular T which feeds aromatase — many men see estradiol rise on HCG, particularly at higher doses.
Evidence: moderate
total testosterone
increase
Monotherapy raises total T modestly; adjunct to TRT primarily preserves intratesticular T and testicular volume rather than further raising serum T.
Evidence: moderate

Monitoring

Total testosterone, estradiol (sensitive assay), and semen analysis if fertility is the goal

The honest risk picture

## Realistic risks of HCG **Estradiol elevation:** HCG ramps up intratesticular T, which feeds aromatase. Men prone to gynecomastia or who already have elevated estradiol on TRT often see further increases. Monitor with a sensitive estradiol assay (LC-MS/MS, not immunoassay). **Leydig cell desensitization:** Supraphysiologic HCG doses (>1,500 IU per dose, frequent dosing) can downregulate LH receptors. Lower, more frequent dosing avoids this. **Quality control:** HCG from compounding pharmacies and gray-market sources varies widely in actual potency. Unregulated products may be underdosed, contaminated, or contain none of the active hormone. **Cost and inconvenience:** HCG requires reconstitution, refrigeration after mixing, and frequent injections. Compliance is harder than weekly testosterone shots. **WADA banned:** Any tested athlete must avoid HCG. **Mood effects:** Some men report irritability or anxiety on HCG, possibly via estradiol shifts. **Not a hypogonadism cure:** HCG monotherapy works only in men with functional Leydig cells. Primary testicular failure does not respond.

Practical context

Cost (US, retail)
$85/mo
Legality
Prescription medication in the US. Banned by WADA and most sports organizations. Frequently sold in gray markets — quality varies.
Interactions
false

FAQ

Why use HCG with TRT?+
TRT shuts down LH signaling, which causes testicular atrophy and suppresses spermatogenesis. Low-dose HCG (250–500 IU 2–3x/week) mimics LH and keeps the testes active — preserving volume, intratesticular T, and fertility.
Can HCG restore fertility after TRT?+
Often yes, alongside SERMs like clomiphene or tamoxifen. The Coviello protocol and similar regimens have restored spermatogenesis in many men, though recovery time varies (3–24 months).
Does HCG raise estrogen?+
Yes. By stimulating intratesticular T production, HCG also increases substrate for aromatization. Some men require an aromatase inhibitor adjustment when adding HCG.
References (4)+
  1. Effects of HCG on Testicular Function in Men with Idiopathic Hypogonadotropic Hypogonadism (Coviello et al., JCEM 2005).
  2. Low-dose HCG maintains intratesticular testosterone in normal men with TRT-induced gonadotropin suppression.
  3. Maintenance of Spermatogenesis in HCG-Treated GnRH-Deficient Men.
  4. Practice of Andrology — HCG protocols in male hypogonadism.
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