HCG

Human Chorionic Gonadotropin · Pregnyl · Novarel

HormonalApprovedApprovedPrescriptionSubQIM

Popular for:Fertility treatment, testosterone support, hormone regulation

394

Registered Trials

725

Trial Publications

16,889

PubMed References

Approved

Evidence Level

Overview

HCG (Human Chorionic Gonadotropin) is a glycoprotein hormone naturally produced during pregnancy by the placenta. The short version: people usually care about it for fertility treatment, testosterone support, hormone regulation, but the strength of the evidence depends heavily on indication and study type.

HCG (Human Chorionic Gonadotropin) is a glycoprotein hormone naturally produced during pregnancy by the placenta. In men, it is used as a pharmaceutical tool to stimulate testosterone production from the testes by mimicking Luteinizing Hormone (LH). It is one of the most well-studied hormones in reproductive medicine with decades of clinical use.

**Originally developed for: **Female fertility treatment (ovulation induction). In men, it has been used clinically for decades for hypogonadism treatment, fertility preservation during TRT, and cryptorchidism (undescended testes) in boys.

Research Snapshot

What the evidence says

Approved

HCG currently shows 394 registered trials from ClinicalTrials.gov, 725 PubMed trial publications (423 RCT-tagged), and 16,889 PubMed references matching the stored source query. Treat PubMed references as literature surface area, not a count of clinical trials.

Known vs uncertain

Known signals

  • 394 registered trials are tracked from ClinicalTrials.gov intervention records.
  • 725 PubMed clinical-trial publications are indexed.
  • 423 PubMed randomized controlled trial publications are indexed.
  • 16,889 PubMed references are tracked separately from trial counts and can include animal, in-vitro, review, mechanism, or clinical records.

Open questions

  • Evidence strength may vary by indication, route, formulation, and population.
  • Public anecdotes can highlight interest or concern but do not establish clinical efficacy.
  • Regulatory status and compounding access can change independently from the research literature.

Mechanism of Action

HCG binds to the LH/CG receptor on Leydig cells in the testes, mimicking the action of LH.

Key Research Benefits

Primary Benefits:

Preserves testicular function and fertility during TRT — prevents testicular atrophy and maintains spermatogenesis (PMC6087849)
Stimulates endogenous testosterone production — safe and effective for hypogonadal symptom relief (PMC6844348)
Maintains intratesticular testosterone (ITT) levels — ITT is 50-100x higher than serum T and critical for spermatogenesis

Secondary Benefits:

Improved mood and well-being associated with maintained hormonal axis
Weight loss support (HCG diet is controversial but widely discussed)
May support pregnenolone and DHEA production via maintained Leydig cell function

Clinical Evidence Summary

Research Pipeline

Preclinical
Animal
Phase I
Phase II
Phase III
Approved

394

Registered Trials

725

Trial Publications

423

RCT Publications

16,889

PubMed References

ClinicalTrials.govPubMed ESearchCurated alias queryChecked May 3, 2026

Registered trials are ClinicalTrials.gov intervention records. Trial publications are PubMed records tagged as clinical trials or randomized controlled trials. PubMed references are broader source-query matches and can include animal studies, in-vitro work, reviews, mechanism papers, and trial publications.

394

Registered trials

725

Trial publications

423

RCT publications

16,889

PubMed references

1,342

Reviews

116

Meta-analyses

Registered trials source

Jun 1, 2026

choriogonadotropin

Uses curated ClinicalTrials.gov intervention aliases to avoid misleading registry matches.

View source

Publication counts source

May 3, 2026

Human Chorionic Gonadotropin, Pregnyl, Novarel

Avoids counting bare HCG acronym matches when the full compound name is available.

View source

- PMC6087849 — "Indications for the use of HCG for the management of infertility in hypogonadal men." Comprehensive review of HCG in male fertility preservation.

- PMC6844348 — HCG monotherapy for hypogonadal symptoms in men with T >300 ng/dL. Found it safe and efficacious with no adverse events.

- Coviello et al. (2008) — Demonstrated that low-dose HCG (250 IU EOD) maintains intratesticular testosterone levels during exogenous testosterone administration.

- Decades of clinical use data — HCG is one of the most well-validated hormones in reproductive medicine with extensive safety data.

Key PubMed References

16,889 PubMed references · showing top 23 by relevance

View all on PubMed

Research Progress on the Impact of Human Chorionic Gonadotropin on Reproductive Performance in Sows.

Review

Li J, Zhu X, Zhu W, et al. · Animals : an open access journal from MDPI · 2024

PMID: 39595318

Differential diagnosis of elevated human chorionic gonadotropin in women.

Review

Williams A · Case reports in women's health · 2023

PMID: 37064211

Effects of intrauterine human chorionic gonadotropin administration on endometrial receptivity and embryo implantation.

Review

Lee D, Lee YG, Won J, et al. · Life sciences · 2022

PMID: 36356892

Progress in understanding the use of human chorionic gonadotropin as a tumor marker.

Review

Grenache DG · Clinical chemistry and laboratory medicine · 2020

PMID: 31926077

Fetal gender, serum human chorionic gonadotropin, and testosterone in women with preeclampsia.

Human Study

Ibrahim ZM, Kishk EA, Elzamlout MS, et al. · Hypertension in pregnancy · 2020

PMID: 32406308

Anecdotes & Sentiment

Public discussion, not clinical evidence

This section summarizes what people are talking about in public sources. It can be useful for spotting questions, hype cycles, and recurring concerns, but it is separate from the evidence sections above.

No curated public-discussion themes are live for HCG yet.

Side Effects & Safety

**Common Side Effects:** - Estrogen elevation (aromatization of stimulated testosterone) — can cause water retention, bloating, mood changes - Injection site pain or irritation - Headaches - Gynecomastia risk if estrogen not managed **Rare but Serious Risks:** - Overstimulation syndrome (more relevant in female fertility use) - Leydig cell desensitization with prolonged high-dose use (controversial — low doses generally safe long-term) - Blood clot risk (theoretical, primarily in female patients) > Contraindications: Hormone-sensitive cancers (prostate, breast).

Common Side Effects:

Estrogen elevation (aromatization of stimulated testosterone) — can cause water retention, bloating, mood changes
Injection site pain or irritation
Headaches
Gynecomastia risk if estrogen not managed

Rare but Serious Risks:

Overstimulation syndrome (more relevant in female fertility use)
Leydig cell desensitization with prolonged high-dose use (controversial — low doses generally safe long-term)
Blood clot risk (theoretical, primarily in female patients)

> Contraindications: Hormone-sensitive cancers (prostate, breast). Precocious puberty. Known hypersensitivity to HCG. Drug interactions: Monitor estradiol when combining with TRT. May need AI (anastrozole) for estrogen management.

Known Interactions

No curated interaction entry is live for HCG yet.

Until the interaction table is fully populated, use the interaction checker and related peptides below to explore adjacent compounds and likely research pairings.

Comparison Pages

Comparison pages

All

No comparison page is linked yet.

Frequently Asked Questions

Research Disclaimer

This page is for research and educational purposes only. The information presented is based on published scientific literature and does not constitute medical advice, diagnosis, or treatment recommendations. Regulatory status can vary by compound, formulation, indication, and jurisdiction. Check official labeling, registry records, and qualified professional guidance before making any health-related decision. The studies referenced are linked to their original PubMed sources for verification.