About hCG
Glycoprotein hormone binding LH receptor on Leydig cells; stimulates testosterone production; prevents testicular atrophy during TRT; maintains spermatogenesis via FSH-like activity
Human chorionic gonadotropin (hCG) is a glycoprotein hormone that acts as a functional analogue of luteinizing hormone (LH), binding to LH receptors on Leydig cells in the testes and granulosa cells in the ovaries to stimulate steroidogenesis. In men, hCG stimulates testicular testosterone production directly, making it a widely used clinical tool for hypogonadotropic hypogonadism, male fertility support, and preservation of testicular function alongside testosterone replacement therapy. Clinical research demonstrates hCG effectiveness for improving testosterone levels and sperm parameters in males with gonadotropin deficiency, as well as for triggering final oocyte maturation in IVF protocols. hCG is an FDA-regulated biologic available in multiple approved formulations; use requires physician supervision due to dose-dependent effects on testosterone, estradiol, and reproductive signaling. hCG dosage in TRT support: in men using testosterone replacement therapy, hCG is prescribed to prevent testicular atrophy and maintain intratesticular testosterone levels needed for spermatogenesis. Typical clinical doses range from 250 to 500 IU subcutaneously administered 2–3 times per week, though protocols vary by provider and individual response. At higher doses, hCG's stimulation of testicular testosterone can also increase aromatization to estradiol — a clinically relevant consideration in TRT management requiring estrogen monitoring. hCG vs gonadorelin: both are used in men's health for testicular preservation alongside TRT, but they act at different axis levels. hCG acts directly on Leydig cell LH receptors, bypassing the pituitary entirely — a direct trophic signal to the testes. Gonadorelin acts upstream at the pituitary to stimulate endogenous LH and FSH release, preserving the full hypothalamic-pituitary-gonadal axis including FSH-driven spermatogenesis. For men prioritizing sperm production, gonadorelin's preservation of FSH signaling offers a potential advantage; for men primarily focused on testicular volume and intratesticular testosterone maintenance, hCG provides a well-validated, direct approach. Telehealth and men's health providers offering hCG and gonadorelin protocols are listed in the PeptideBase directory.
hCG Benefits & Research Areas
Research Signals
Commonly researched in the context of
Population research notes
These signals reflect research interest areas, not treatment indications.
Regulatory & Evidence
Risk Profile
Moderate risk profile in research contexts. Review contraindications and administration guidelines before use.
Regulatory Status
- Availability Status
- Prescription
- FDA Status
- FDA Approved
FDA-approved prescription drug (Pregnyl, Novarel, NDA 019478). Approved for fertility and male hypogonadism. FDA banned OTC homeopathic hCG Dec 2011. Prescription Rx products remain approved.
Regulatory status reflects publicly available information and may change. This is not legal or medical advice.
Research Sources
7 sources cited · 5 moderate · 2 weak
1 RCT · 4 Cohorts · 1 Case series · 1 In vitro
Peripheral Precocious Puberty in a Girl with hCG-Secreting Suprasellar Germ Cell Tumor: Authors' Reply.
Indian J Pediatr · 2026
# Summary Research found that a suprasellar germ cell tumor secreting human chorionic gonadotropin (hCG) can cause peripheral precocious puberty in pediatric patients. This study demonstrated the clinical relationship between hCG-producing tumors and early pubertal development in children.
Epidemiological study of Ectopic Pregnancy at Sulaimani Maternity Teaching Hospital, Iraq: A cross-sectional study.
Medicine (Baltimore) · 2026
# Summary Research found that serum β-hCG testing combined with transvaginal ultrasonography successfully confirmed ectopic pregnancy diagnosis in a cross-sectional study of 393 women with early pregnancy, identifying 79 cases (20.1%) with ectopic implantation. This study demonstrated that elevated β-hCG levels, along with imaging findings, were essential diagnostic tools for identifying ectopic pregnancies, with tubal pregnancies representing the majority of cases (82.3%).
Unexpected elevation of β-hCG in EGFR-mutant lung adenocarcinoma: a case study and implications for clinical practice.
BMC Pulm Med · 2026
# Summary Research found that β-hCG elevation is exceptionally rare in non-small cell lung cancer, with this case study representing the first documented occurrence of pulmonary adenocarcinoma presenting with both significantly elevated serum β-hCG levels and an EGFR mutation. This study demonstrated an unusual tumor marker profile in an EGFR-mutant lung adenocarcinoma patient, highlighting an atypical presentation that clinicians may encounter in lung cancer cases.
Show 4 more sources ↓
Safety evaluation of a novel progesterone vaginal ring (PVR) for luteal phase support: SARA trial.
Drug Deliv Transl Res · 2026
# Summary Research found that a reformulated progesterone vaginal ring demonstrated comparable safety and tolerability to the previous version, with a spontaneous abortion rate of 7.4% that met predefined safety thresholds. This study demonstrated good clinical pregnancy outcomes (43.2%) and favorable tolerability in women undergoing fertility treatment with fresh embryo transfer.
FTO regulates testosterone secretion in Leydig cells: insights into the role of m6A modifications and the therapeutic potential of hCG
Reproductive Biology and Endocrinology · 2025
Research in 39 men with obstructive azoospermia and Leydig cell cultures found a positive correlation between FTO expression and testosterone concentrations; FTO knockdown reduced testosterone secretion and increased apoptosis, while hCG treatment significantly restored testosterone levels (18-37% recovery, p<0.003 at all time points), providing mechanistic evidence for hCG's LH-receptor-mediated testosterone stimulation in Leydig cells.
Abdominal complete hydatidiform mole following uterine evacuation: a case report.
Front Oncol · 2026
# Summary Research found that abdominal complete hydatidiform mole, though exceedingly rare, should be considered in patients who show persistent or rising serum hCG levels following uterine evacuation for molar pregnancy. This study demonstrated that postoperative hCG monitoring is critical for early detection of ectopic molar tissue, as imaging studies alone may fail to identify abdominal implantation sites.
Comparison of the effect of combined therapy of HCG ampule and letrozole tablet with each method separately on the spermogram parameters in the obese men with idiopathic infertility: a clinical trial
American Journal of Clinical and Experimental Urology · 2022
Research in a small randomized clinical trial of 15 obese infertile men found that combined hCG plus letrozole therapy produced significantly greater improvements in sperm count, motility, and morphology than either hCG or letrozole alone, providing preliminary evidence that hCG-based testosterone stimulation synergizes with aromatase inhibition in male factor infertility.
hCG Side Effects & Safety Considerations
Moderate risk profile. Review all reported considerations carefully before use.
Reported contraindications & considerations
Common monitoring markers in research protocols
Standard reproductive endocrinology panels establish HPG axis baseline before hCG use. Testosterone and E2 confirm gonadal response; LH suppression during treatment is an expected finding.
Consult a qualified healthcare professional before making any health decisions. This information is educational only and does not constitute medical advice.
Where to Buy hCG — Providers & Availability
39 providersClinics
10 providersAdvanced Age Management
United StatesView →Optimal Hormone Health & Aesthetics
United StatesView →Quali-T Hormone Optimization
United StatesView →The Natural Path
United StatesView →Cratos Health
United StatesView →Optimal Wellness MD
United StatesView →Peptides Therapy San Diego
United StatesView →Pura Vida Body & Mind Spa
United StatesView →Vitality Rejuvenation Clinic
United StatesView →Mirror Mirror Aesthetics & Wellness
United StatesView →
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Questions to Ask Your Provider
Frequently Asked Questions — hCG
Human chorionic gonadotropin (hCG) is a glycoprotein hormone that acts as a functional analogue of luteinizing hormone (LH), binding to LH receptors on Leydig cells in the testes and granulosa cells in the ovaries to stimulate steroidogenesis. In men, hCG stimulates testicular testosterone production directly, making it a widely used clinical tool for hypogonadotropic hypogonadism, male fertility support, and preservation of testicular function alongside testosterone replacement therapy.
direct Leydig cell LH-receptor stimulation for testosterone production, testicular volume maintenance during testosterone therapy, IVF oocyte maturation trigger in female fertility protocols, dose-dependent estradiol increase — aromatization monitoring relevant.
Research on hCG primarily documents effects related to direct Leydig cell LH-receptor stimulation for testosterone production and testicular volume maintenance during testosterone therapy and IVF oocyte maturation trigger in female fertility protocols and dose-dependent estradiol increase — aromatization monitoring relevant. These are areas covered in preclinical and clinical literature — individual response varies and effects depend on context of use.
Reported contraindications and considerations for hCG include hormone-sensitive cancers, polycythemia, precocious puberty. This is educational information only — consult a qualified healthcare professional before use.
39 providers in the directory currently offer hCG.
# Summary Research found that a suprasellar germ cell tumor secreting human chorionic gonadotropin (hCG) can cause peripheral precocious puberty in pediatric patients. This study demonstrated the clinical relationship between hCG-producing tumors and early pubertal development in children.