hCG: Restoring Natural Testosterone and Sperm Production
An FDA-approved hormone that mimics LH, restoring the body's own testosterone and sperm production — the label dates to 1962.
What is hCG (Human Chorionic Gonadotropin)?
hCG (human chorionic gonadotropin) is a hormone that mimics LH (luteinizing hormone), the pituitary's own signal telling the testes to produce testosterone. By standing in for that signal, hCG raises a man's endogenous testosterone and keeps sperm production going — restoring the hormonal machinery that testosterone therapy would otherwise suppress. It carries a genuine FDA label dating back to 1962, approved for hypogonadotropic hypogonadism and fertility use, and is one of the most established TRT-adjunct compounds in clinical use. It is not the same as the 'hCG diet' — that use isn't part of its approved label or supporting evidence.
Quick facts
- Half-Life
- ~24-36 hours
- Class
- Glycoprotein hormone, LH-receptor agonist
- Brand Names
- Pregnyl, Novarel, Ovidrel
- Legal Status
- Prescription-only, FDA-approved (label dating to 1962) for hypogonadotropic hypogonadism and fertility use
- Category
- Hormone Therapy
- Storage
- Store the lyophilized vial refrigerated (2-8°C) or at -20°C, away from light. Once reconstituted, keep refrigerated at 2-8°C and use promptly.
Dosing at a glance
5,000 IU vial + 5mL bacteriostatic water = 1000 IU/mL. A 250 IU dose is 0.25mL (25 units on an insulin syringe). Run the numbers in the reconstitution calculator.
Doses shown are those reported in published research, not a recommendation.
What the evidence supports
| Claim | Grade | Basis |
|---|---|---|
| Testosterone / Fertility Restoration | Sgrade | Madhusoodanan 2019 (n=20): hCG monotherapy raised testosterone ~50%, with symptom improvement in half of men. FDA label dates to 1962. |
hCG (Human Chorionic Gonadotropin) Mechanism of Action
Mimicking LH to Restart Testicular Function
hCG is structurally similar enough to LH (luteinizing hormone) that it binds and activates the same LH receptor on testicular Leydig cells, which respond by producing testosterone — the same signal the pituitary would normally send. This is why hCG can restore the body's own testosterone production even when the pituitary itself isn't sending that signal, whether due to a medical condition or exogenous testosterone therapy's suppressive feedback.
Preserving Fertility Alongside TRT
Because it directly stimulates the testes rather than relying on upstream pituitary signaling, hCG keeps spermatogenesis active during testosterone replacement therapy — a key reason it's the most established TRT-adjunct compound for men who want to preserve fertility while on exogenous testosterone.
hCG (Human Chorionic Gonadotropin) Dosage and Protocols
TRT-Adjacent Dosing
TRT-adjacent protocols commonly dose hCG at 250–500 IU subcutaneous, 2-3 times weekly — lower and more frequent than the larger doses used for fertility-induction protocols, which are prescriber-directed and higher.
hCG (Human Chorionic Gonadotropin) Side Effects and Safety
Estrogen-Related Effects at Higher Doses
Because raising testosterone via hCG also increases aromatization to estradiol, higher doses can cause estrogen-related effects (water retention, gynecomastia sensitivity) — sometimes managed with an aromatase inhibitor like anastrozole. Injection-site irritation and mood changes are also reported. Hormone-sensitive cancers and precocious puberty are contraindications.
hCG (Human Chorionic Gonadotropin) Research Evidence
A Six-Decade-Old FDA Label
hCG's FDA approval for hypogonadotropic hypogonadism and fertility use dates back to 1962 — one of the oldest, most established hormone therapies in this catalog. In a 2019 study (Madhusoodanan et al., n=20) of men taking hCG as monotherapy, testosterone rose approximately 50%, with roughly half reporting symptom improvement — low libido and erectile dysfunction were each the presenting complaint in 45% of participants.
Regulatory and Legal Status
hCG is prescription-only and FDA-approved, with an exceptionally long track record. It should be obtained through a licensed prescriber and pharmacy. Note: the popular 'hCG diet' (very-low-calorie dieting combined with hCG for weight loss) is not part of hCG's approved label or supported by its evidence base — the FDA has specifically warned against marketing hCG for weight loss.
hCG (Human Chorionic Gonadotropin) Stacking and Combinations
hCG + Testosterone Cypionate
The standard, well-established pairing is hCG alongside testosterone cypionate or other exogenous androgens, specifically to preserve testicular size and fertility during TRT — the most clinically mainstream TRT-adjunct pairing in this catalog, alongside gonadorelin as an alternative.
hCG (Human Chorionic Gonadotropin) Pharmacokinetics
Long Half-Life Supporting Infrequent Dosing
hCG has a plasma half-life of roughly 24-36 hours, notably longer than most peptide hormones in this catalog — which is why it's dosed just 2-3 times weekly rather than daily.
Contraindications
- pregnancy
- hormone-sensitive cancers
- precocious puberty
Trials and reviews
- Madhusoodanan hCG monotherapyclinical study2019
Testosterone rose ~50% on hCG alone (n=20)
Frequently asked questions
What is a typical hCG (Human Chorionic Gonadotropin) dose?
Published research protocols report 250–500 IU, 2–3x weekly. This is the range described in the literature, not a recommendation.
What is the half-life of hCG (Human Chorionic Gonadotropin)?
~24-36 hours.
Is hCG (Human Chorionic Gonadotropin) backed by strong evidence?
hCG (Human Chorionic Gonadotropin) carries a REGEN research grade of S. REGEN Research Tier S — official FDA approval, label dating to 1962.
How is hCG (Human Chorionic Gonadotropin) administered?
Routes reported in the literature: subcutaneous, intramuscular.
Who should avoid hCG (Human Chorionic Gonadotropin)?
Contraindications noted in the literature include pregnancy, hormone-sensitive cancers, precocious puberty.
References
- hCG monotherapy for hypogonadism · Madhusoodanan V, et al. · 2019