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Hormones

Human Chorionic Gonadotropin (HCG), explained simply

A powerful hormone that mimics luteinizing hormone (LH) to stimulate your body's natural testosterone production while keeping your fertility intact—like having your cake and eating it too for men on hormone therapy.

Well studied in peopleInjection under the skin (like insulin shots)23 cited sourcesResearch compound — not FDA approved

Start here

What is Human Chorionic Gonadotropin (HCG)?

Human chorionic gonadotropin (HCG) is a natural hormone that closely mimics LH, the signal that tells the testes to produce testosterone. Men on testosterone therapy use it to keep natural testosterone production and fertility intact 18, and it can help restart the body's own hormone production after steroid use or hormone therapy 1516. It is FDA-approved, though for other uses than these.

How it works in your body

HCG is a hormone that tricks your body into thinking it's receiving the signal to make testosterone. Normally, your brain releases LH (luteinizing hormone) which tells your testes to produce testosterone and keep sperm production running. When you take external testosterone, your brain stops sending that LH signal because it thinks there's enough testosterone already. HCG steps in and mimics LH, binding to the same receptors on your testes and keeping them active—producing testosterone and maintaining sperm production even when you're on TRT 6713.

The deeper mechanism, for the curious

Human chorionic gonadotropin (HCG) is a large hormone made of two linked parts, an alpha part and a beta part. The alpha part is shared with LH, FSH, and TSH (three other hormones). The beta part is unique to HCG and gives it its specific job 6. HCG attaches tightly to the LH/CG receptor (LHCGR, a docking site) on Leydig cells (the testicle cells that make testosterone). That starts a signal chain: it activates adenylyl cyclase, which raises cAMP (a messenger molecule inside the cell), which turns up StAR (a protein that moves cholesterol to where steroid hormones are built) and the enzymes that build steroid hormones. The result is testosterone made from cholesterol by the standard steroid-building pathway 12. HCG lasts much longer in the blood than LH: a half-life (how long it stays active in your body) of 24-36 hours versus 20 minutes. It has more sialic acid (a sugar coating) that slows the kidneys from clearing it 11. The testosterone HCG keeps up inside the testes is essential for making sperm, because Sertoli cells (the cells that nurture developing sperm) need testosterone signals from nearby cells to grow sperm cells properly 17. HCG's beta part also carries the carboxy-terminal peptide (CTP, an extra tail) that makes it more stable and keeps it attached to the receptor longer 11.

Evidence check

Well studied in people

This has been through large human trials — the strongest kind of evidence. Scientists have tested it on many people and measured what actually happened.

Every numbered marker on this page links to one of the 23 sources at the bottom.

95/100

Fertility Preservation

Gold standard for maintaining sperm production during TRT—research shows ~80% success rate in preserving or restoring spermatogenesis

92/100

Testicular Health

Highly effective at preventing and reversing testicular atrophy caused by external testosterone or steroid use

88/100

Hormone Balance

Supports natural testosterone production and helps maintain healthy intratesticular hormone levels alongside TRT

What the research points to

The most-asked question

How much Human Chorionic Gonadotropin (HCG) do I take?

The research-reported range is 500–1500 IU, twice weekly. Studies used different doses for different situations — find yours:

  1. Fertility preservation on TRT, Testicular maintenance

    500-1,500 IU

    • How often
      2-3 times per week
    • For how long
      Ongoing, alongside TRT (testosterone replacement therapy)
    • How
      Injection under the skin

    Documented clinical practice for preserving testicular function/fertility in men on testosterone therapy; 1,500-2,000 IU 2-3x/week is used for hypogonadotropic hypogonadism 6. The popular 500 IU 2-3x/week maintenance figure reflects real-world practice rather than the FDA label. In controlled dosing, 250 IU every other day held intratesticular testosterone within 7% of baseline and 500 IU raised it 26% above baseline during testosterone administration 7; 500 IU every other day preserved semen parameters with no azoospermia in men on TRT 8.

  2. Hypogonadotropic hypogonadism

    500-1,000 IU

    • How often
      3 times weekly for 3 weeks, then 2 times weekly for 3 weeks
    • For how long
      6-week induction course
    • How
      Injection into a muscle

    FDA-labeled regimen for male hypogonadotropic hypogonadism (Pregnyl) 7. Intramuscular (into a muscle) is the only labeled route.

  3. Spermatogenesis induction

    4,000 IU then taper to 2,000 IU

    • How often
      3 times weekly
    • For how long
      4,000 IU for 6-9 months, then 2,000 IU for 3 additional months
    • How
      Injection into a muscle

    Higher-dose FDA-labeled regimen for inducing spermatogenesis/testicular descent (Pregnyl) 7.

Adjusting your dose

You're at the right dose if…

  • Testicles maintain normal size and firmness
  • Hormone levels (testosterone, estrogen, LH) are in healthy ranges
  • Sperm production maintained or improved (if monitored)
  • No significant side effects like gynecomastia or water retention

Consider going up if…

  • Testicular volume continues to decrease despite current dose
  • Sperm count remains suppressed when fertility is the goal
  • Your doctor determines testosterone response is inadequate
  • You're transitioning to a fertility-focused protocol

Go down if…

  • Estrogen levels rise too high (confirmed by blood work)
  • You experience significant water retention or bloating
  • Gynecomastia symptoms develop (tender or swelling breast tissue)
  • Mood swings or irritability become problematic

The ceiling: 2000 IU three times weekly (6000 IU/week maximum, typically only for fertility protocols under specialist supervision) 6

Reconstitution, in plain words

How do I mix Human Chorionic Gonadotropin (HCG)?

Peptides usually arrive as a freeze-dried powder in a small vial. “Reconstitution” just means adding sterile water back in so you can measure a dose. Here's how it works for Human Chorionic Gonadotropin (HCG):

What you need

  • Bacteriostatic water (BAC water)—the preservative allows multiple uses
  • Insulin syringes (29-31 gauge)—thin needles for comfortable injections
  • Alcohol swabs for cleaning vial tops and injection sites
  • Your HCG powder vial (typically 5,000 IU or 10,000 IU)

A worked example

If you have a 5,000 IU vial and add 2.5mL of BAC water, you get a concentration of 2,000 IU/mL. So every 0.25mL (25 units on an insulin syringe) equals 500 IU of HCG.

Working out your dose

For a 500 IU dose at 2,000 IU/mL concentration: draw 0.25mL (25 units on a standard insulin syringe). For 1,000 IU: draw 0.5mL (50 units).

Or let the calculator do it

Three quick questions — your vial, your water, your dose — and it tells you the exact syringe mark. “Find dose amount” is preloaded with Human Chorionic Gonadotropin (HCG)'s recorded schedule.

Human Chorionic Gonadotropin (HCG)2-3 times per week

How much peptide is in your bottle?

Look at the label on the vial. It’s the number next to the unit — like "5 mg". Labeled in IU? Switch the unit to IU.

Type a number to continue.
0

Injection sites & technique

Where do I inject Human Chorionic Gonadotropin (HCG)?

The best spots

  • Belly fat area (about 2 inches away from your belly button)
  • Front or outer thigh (middle section)
  • Upper outer buttock area (for IM injections)

How to do it, step by step

  • Wash your hands thoroughly with soap and water
  • Clean the injection site with an alcohol swab and let it air dry
  • For subcutaneous (under the skin): pinch about an inch of skin to create a fold
  • Insert the needle at a 45-90 degree angle (45 if you're lean, 90 if you have more tissue)
  • Push the plunger slowly and steadily over 5-10 seconds
  • Wait a few seconds before removing the needle
  • Apply light pressure with a clean swab if needed—don't rub

Subcutaneous (under the skin) injection (just under the skin) or intramuscular (into a muscle) injection—subcutaneous is easier for self-administration and equally effective

Timing

When do I take Human Chorionic Gonadotropin (HCG)?

Best time of day

Most men inject HCG on set days—for example, Monday and Thursday, or Sunday and Wednesday. Time of day doesn't matter much, but consistency helps you remember. Some prefer morning injections.

With or without food?

HCG can be taken regardless of food timing. Absorption is not affected by meals since it's injected, not taken orally.

Taking it with other peptides

When using with testosterone, inject HCG on the same days or alternate days—both approaches work. 78 If using an aromatase inhibitor, take it as prescribed to manage any estrogen increase from HCG 18.

The honest list

What side effects could Human Chorionic Gonadotropin (HCG) cause?

Common — usually mild

These show up most often. They usually fade as your body adjusts.

Less common

Worth knowing about, but most people never see these.

Serious — stop and get medical help

Rare, but if any of these happen, stop and contact a medical professional.

Week by week

What should I expect from Human Chorionic Gonadotropin (HCG), and when?

  1. Week 1-2

    You might notice
    • Injection site reactions as your body gets used to the medication
    • Possible mild headaches or fatigue during adjustment
    • Some men notice improved mood or libido relatively quickly
    • Your body is beginning to respond to the LH-like stimulation
    What's normal
    • Not feeling dramatic changes yet—HCG works gradually
    • Minor injection site redness or soreness that fades
    • Some water retention or mild bloating
    What's next
    • Continue your prescribed protocol consistently
    • Track how you feel in a simple log
    • Side effects typically improve after the first couple weeks

  2. Week 3-6

    You might notice
    • Testicles maintaining size or returning to fuller size
    • Stable testosterone levels when combined with TRT
    • Improved energy, libido, and overall well-being
    • Body adjusting to the hormonal changes
    What's normal
    • Settling into the routine with fewer initial side effects
    • Noticeable testicular fullness compared to before HCG
    • Stable mood and energy levels
    What's next
    • Blood work at 4-6 weeks to check testosterone, estrogen, and other markers
    • Dose adjustments may be made based on lab results
    • Continue monitoring for any gynecomastia signs

  3. Week 8-12 and beyond

    You might notice
    • Sustained testicular size and function
    • For fertility goals: sperm count may be returning or maintained
    • Stable hormonal balance with good quality of life
    • Long-term benefits becoming apparent
    What's normal
    • HCG becomes a routine part of your protocol
    • Consistent results with minimal side effects
    • Fertility preserved or improving (if that's your goal)
    What's next
    • Regular monitoring every 3-6 months (blood work)
    • Semen analysis if fertility is the goal
    • Ongoing protocol adjustments as needed based on labs and symptoms

How to tell it's actually working

Testicular Health Indicators

  • Testicles maintain normal size and firmness (no shrinkage)
  • Testicles feel full rather than soft or atrophied
  • No continued decrease in testicular volume while on TRT

Hormonal Balance

  • Blood work shows maintained or improved testosterone levels
  • Estrogen levels are within healthy range (managed if elevated)
  • LH and FSH levels appropriate for your protocol
  • Overall hormone panel looks balanced

Fertility Markers (if applicable)

  • Semen analysis shows sperm present and improving counts
  • Sperm motility and morphology within acceptable ranges
  • FSH levels responding appropriately (in combination protocols)

Quality of Life

  • Maintained or improved libido and sexual function
  • Stable energy levels throughout the day
  • Good mood and mental clarity
  • No significant unwanted side effects

Not seeing anything? The usual reasons

  • Dose too low—some men need higher doses to maintain testicular function, especially if already significantly suppressed
  • Poor quality HCG from unreliable source—always use pharmaceutical-grade product from licensed pharmacies
  • Improper storage degraded the hormone—HCG is a protein and degrades if not refrigerated or if frozen after reconstitution
  • Not enough time—testicular recovery and spermatogenesis take months, not weeks
  • Estrogen rising unchecked—high estrogen can counteract some benefits; may need an aromatase inhibitor
  • Underlying primary hypogonadism—if testes are damaged, they may not respond to HCG (it requires functioning Leydig cells)

Is it right for you?

Who should avoid Human Chorionic Gonadotropin (HCG)?

Do not use it if…

  • You have a hormone-sensitive cancer such as prostate cancer—HCG raises testosterone, which could fuel tumor growth
  • You have a history of blood clots—HCG may increase clotting risk in susceptible people
  • You're a woman trying to use HCG for weight loss—this use is not FDA approved and studies show it doesn't work
  • You have precocious puberty (puberty starting too early) or a child with early puberty signs—HCG can speed up puberty
  • You've had an allergic reaction to HCG or similar hormone products before

Be extra careful if…

  • You have heart disease or are at risk for heart problems—monitor closely
  • You're prone to gynecomastia (male breast tissue growth)—HCG can raise estrogen by converting testosterone into estrogen
  • You have a history of migraines—headaches may worsen at first
  • You have kidney disease—fluid retention effects may be stronger
  • You take blood thinners—watch for bleeding at the injection site
  • You have epilepsy—there are rare reports of changes in seizure risk

When to stop

  • Signs of allergic reaction—rash, hives, swelling, difficulty breathing (stop immediately, seek emergency care)
  • Significant gynecomastia development that doesn't respond to estrogen management
  • Blood clot symptoms—sudden leg pain/swelling, chest pain, shortness of breath (stop immediately, seek emergency care)
  • Your fertility or TRT goals have been achieved and your doctor recommends discontinuation
  • Unacceptable side effects that don't improve with dose adjustments
  • Development of hormone-sensitive conditions

HCG is a prescription medication and should only be used under medical supervision. Never start, stop, or adjust your dosing without consulting your healthcare provider. This information is for educational purposes only—not medical advice.

What it mixes badly (and well) with

Medications

  • OK together
    Testosterone (TRT)

    Commonly used together. HCG helps keep the testicles working during TRT (testosterone replacement therapy). This is a standard protocol.

  • OK together
    Clomiphene citrate

    Often combined for fertility protocols or PCT (post-cycle therapy, recovery after a steroid cycle). Both raise testosterone through different routes.

  • Check first
    Aromatase inhibitors (Anastrozole)

    Aromatase inhibitors lower estrogen. They may be needed to control estrogen that rises with HCG use. Monitor levels and dose appropriately.

  • Check first
    Blood thinners (Warfarin, etc.)

    May increase bruising at injection sites. Monitor INR (a blood test of clotting) closely, as hormone changes can affect clotting.

  • Check first
    Thyroid medications

    HCG has weak TSH-like activity (it can slightly mimic the hormone that drives your thyroid). Monitor thyroid function if you take thyroid medication.

Other peptides

  • Check first
    Gonadorelin

    Both stimulate the reproductive hormone system through different routes. Can be used together in some protocols but monitor hormone levels carefully.

  • OK together
    Kisspeptin

    Experimental combination. Both affect release of gonadotropins (LH and FSH). Little data on using them at the same time.

  • OK together
    BPC-157

    No known interaction. Different mechanisms of action.

Supplements

  • Check first
    DHEA

    Both affect hormone levels. Use together carefully and monitor hormone panels (blood tests).

  • OK together
    Zinc

    Zinc supports testosterone production and is safe to take with HCG.

  • OK together
    Vitamin D

    Important for hormone health. Safe and potentially complementary.

  • OK together
    DIM (Diindolylmethane)

    May help the body process estrogen. Can be used alongside HCG.

Who it tends to suit

Fertility Preservation During TRT

If you're on testosterone therapy but want to keep your swimmers swimming, HCG is your best friend. It keeps your testes active and producing sperm even when external testosterone would normally shut that down. Research shows it can maintain or restore spermatogenesis in about 80% of men 348.

Preventing Testicular Shrinkage (Atrophy)

Nobody wants their boys to shrink. When you take outside testosterone, your brain stops signaling your testes to work, and they get smaller from disuse. HCG copies LH (the brain's signal that keeps the testes active), maintaining their size and function 614.

Hypogonadotropic Hypogonadism (low sex hormones because the brain is not signaling the testes)

If your pituitary (the master hormone gland at the base of the brain) gland (the hormone control gland at the base of your brain) isn't sending the right signals to your testes (low LH), HCG can step in and do the job. It's been used for decades to treat this condition, helping men reach normal testosterone levels and fertility 3613.

Recovery After a Steroid Cycle (Post-Cycle Therapy)

After using anabolic (muscle-building) steroids, your natural hormone production is suppressed. HCG can help jumpstart your testes back into action, speeding up the recovery of your natural testosterone production. It's often used as part of a comprehensive PCT protocol 915.

The safety picture overall

HCG has been used medically for over 80 years with a well-established safety profile. 10 When used appropriately for male hypogonadism (low testosterone) or fertility preservation, side effects are generally mild and manageable. The most common issues come from higher estrogen, because extra testosterone gets converted into estrogen (aromatization). This can be managed with aromatase inhibitors (drugs that block that conversion) if needed. 618 Serious side effects are rare when HCG is used under medical supervision.

HCG is FDA-approved for specific uses, including hypogonadotropic hypogonadism in males (low testosterone caused by a lack of the brain's signal to the testes). 6 There is substantial clinical evidence from decades of use in fertility medicine and more recent research on its role in testosterone replacement therapy. Large real-world studies have confirmed its safety and effectiveness when properly monitored 5.

Keeping it good

How do I store Human Chorionic Gonadotropin (HCG)?

Before mixing (powder)

Keep your HCG powder in the refrigerator (36-46°F / 2-8°C). While some products claim room temperature stability, refrigeration extends shelf life. Store in the original sealed vial away from light. Properly stored powder remains stable for 1-2 years.

After mixing (liquid)

Once mixed with bacteriostatic water, refrigerate at 36-46°F (2-8°C). Never freeze the reconstituted solution—freezing damages the protein structure and destroys the hormone. Keep away from light. Use within 30-60 days depending on your provider's guidance.

Signs it has gone bad

  • Cloudy or hazy appearance (should be crystal clear)
  • Visible particles floating or settled at the bottom
  • Color changes—any discoloration means discard it
  • Clumping or precipitation that doesn't dissolve when gently swirled

Not our opinion — the published record

What the studies actually found about Human Chorionic Gonadotropin (HCG)

2018

Indications for the use of human chorionic gonadotropic hormone for the management of infertility in hypogonadal men

This review established that HCG therapy can help restore or maintain sperm production (spermatogenesis) in men with hypogonadism (low testosterone because the testes under-produce), making it an essential tool for preserving fertility during testosterone therapy. It highlighted HCG's role in maintaining intratesticular testosterone levels (testosterone inside the testes).

Lee JA, Ramasamy R

2015

Preserving fertility in the hypogonadal patient: an update

This study showed that HCG can reverse azoospermia (no sperm in semen) caused by testosterone therapy and keep testosterone inside the testes high. The research showed that combining HCG with SERMs (selective estrogen receptor modulators, drugs that block estrogen's action in some tissues) effectively maintains sperm production in men with hypogonadism.

Ramasamy R, Armstrong JM, Lipshultz LI

2021

Gonadotropin Treatment for the Male Hypogonadotropic Hypogonadism

This broad review found that combined HCG and FSH therapy promotes testicular growth in almost all patients, sperm production in approximately 80%, and pregnancy rates around 50% in men with hypogonadotropic hypogonadism (low sex hormones because the brain's signal is missing). Treatment lasting 12-24 months was typical for best results.

Boeri L, Capogrosso P, Salonia A

2005

Low-dose human chorionic gonadotropin maintains intratesticular testosterone in normal men with testosterone-induced gonadotropin suppression

Twenty-nine men with normal reproductive function received 200 mg testosterone enanthate weekly plus saline or 125, 250, or 500 IU hCG every other day for three weeks. Intratesticular testosterone (testosterone inside the testes) fell 25% below baseline at 125 IU, stayed within 7% of baseline at 250 IU, and rose 26% above baseline at 500 IU. This identified the every-other-day low-dose range that keeps testosterone in the testes up during testosterone use from outside the body.

Coviello AD, Matsumoto AM, Bremner WJ, Herbst KL, Amory JK, Anawalt BD, et al.

2025

Efficacy of human chorionic gonadotropin hormone in restoring spermatogenesis in men using non-prescribed androgens: a retrospective analysis of real-world data

Nineteen men at a Dutch harm-reduction clinic who kept using non-prescribed androgens (steroid-type hormones) were treated with hCG; mean total sperm count rose from 18.0 to 146.9 million and total motile sperm count (sperm that can swim) from 1.1 to 66.9 million. A minority remained oligospermic (low sperm count) or azoospermic (no sperm).

Smit DL, Verdegaal T, Bond P

If this isn't the right fit

What people use instead of Human Chorionic Gonadotropin (HCG)

Stimulating natural testosterone without injections

  • Clomiphene citrate (Clomid)
  • Enclomiphene
  • Gonadorelin

Fertility treatment in hypogonadal men

  • FSH (follicle-stimulating hormone, a hormone that drives egg or sperm development)
  • hMG (human menopausal gonadotropin, a fertility hormone mix)
  • GnRH pulsatile therapy (GnRH given in regular pulses)

Testosterone optimization without fertility concerns

  • Testosterone replacement therapy (TRT)
  • Clomiphene monotherapy
  • Lifestyle optimization

Your questions

Human Chorionic Gonadotropin (HCG) FAQ

Why would I need HCG if I'm already taking testosterone?

When you take external testosterone, your brain thinks you have enough and stops telling your testes to work. Over time, your testes can shrink and stop making sperm. HCG keeps your testes active and functioning, preventing shrinkage and maintaining fertility—a major advantage if you ever want to have kids or simply want to keep things working down there 18.

Does HCG work for weight loss?

No. The 'HCG diet' combined very low calories (500 per day) with HCG injections, but multiple studies have shown the weight loss comes from the extreme calorie restriction, not the HCG. 619 The FDA has called HCG weight loss products fraudulent. 20 Don't use HCG for weight loss—it doesn't work and the severe calorie restriction is unhealthy.

How long until HCG starts working?

You may notice some effects like testicular fullness within a few weeks. However, for fertility goals, sperm production takes about 74 days (the full spermatogenesis cycle), 21 so meaningful improvements in sperm counts typically take 3-6 months of consistent use. For maintaining testicular size, you'll often notice benefits within the first month.

Can HCG cause gynecomastia (man boobs)?

Yes, it can. HCG increases testosterone production in your testes, and some of that testosterone converts to estrogen through an enzyme called aromatase. If estrogen rises too high, it can cause breast tissue growth. This is manageable with proper monitoring and, if needed, an aromatase inhibitor. Regular blood work helps catch rising estrogen early 614.

Is HCG the same as steroids?

No. HCG is a hormone that stimulates your own testes to produce testosterone—it's not testosterone itself. Think of it as a signal that tells your body to make its own hormones, rather than providing external hormones directly. It's often used alongside testosterone therapy to maintain natural testicular function 6.

Can I use HCG on its own without testosterone?

Yes, some men use HCG monotherapy to boost their natural testosterone production without taking external testosterone. This approach maintains fertility and testicular function while increasing testosterone levels. However, the testosterone boost from HCG alone is typically more modest than from TRT, so it depends on your specific situation and goals 131617.

How often do I need blood work while on HCG?

Most doctors recommend blood work every 4-6 weeks when starting HCG, then every 3-6 months once you're stable. Key markers to monitor include testosterone (total and free), estrogen (estradiol), hematocrit, and PSA. 1618 If fertility is your goal, periodic semen analyses are also important.

Will my testicles go back to normal size with HCG?

In most cases, yes. If your testicles have shrunk from TRT or steroid use, HCG can restore their size over time. How much they recover depends on how long they were suppressed and individual factors. Most men see significant improvement within a few months of consistent HCG use 31422.

23 sources

References

Every numbered marker on this page points to one of these. Same sources, same numbering as the Human Chorionic Gonadotropin (HCG) research profile on Peptide Initiative.

  1. Indications for the use of human chorionic gonadotropic hormone for the management of infertility in hypogonadal menLee JA, Ramasamy R · 2018
  2. Preserving fertility in the hypogonadal patient: an updateRamasamy R, Armstrong JM, Lipshultz LI · 2015
  3. Gonadotropin Treatment for the Male Hypogonadotropic HypogonadismBoeri L, Capogrosso P, Salonia A · 2021
  4. Induction of Spermatogenesis and Its Predictors in Men with Prepubertal-Onset Hypogonadotropic HypogonadismCho MC, Lee H, Kim SW · 2025
  5. Real-World Outcomes and Safety of Testosterone Therapy: A Longitudinal, Retrospective Cohort StudyClift AK, Johnson H, Huang DR, Morgentaler A · 2026
  6. Pregnyl (chorionic gonadotropin for injection, USP) Prescribing InformationOrganon (FDA label / DailyMed) · 2023
  7. Low-dose human chorionic gonadotropin maintains intratesticular testosterone in normal men with testosterone-induced gonadotropin suppressionCoviello AD, Matsumoto AM, Bremner WJ, Herbst KL, Amory JK, Anawalt BD, et al. · 2005
  8. Concomitant intramuscular human chorionic gonadotropin preserves spermatogenesis in men undergoing testosterone replacement therapyHsieh TC, Pastuszak AW, Hwang K, Lipshultz LI · 2013
  9. Efficacy of human chorionic gonadotropin hormone in restoring spermatogenesis in men using non-prescribed androgens: a retrospective analysis of real-world dataSmit DL, Verdegaal T, Bond P · 2025
  10. Historical perspectives in gonadotrophin therapyLunenfeld B · 2004
  11. Influence of human chorionic gonadotrophin during ovarian stimulation: an overviewSmitz J, Platteau P · 2020
  12. Leydig cells: formation, function, and regulationZirkin BR, Papadopoulos V · 2018
  13. Fertility induction in hypogonadotropic hypogonadal menPrior M, Stewart J, McEleny K, Dwyer AA, Quinton R · 2018
  14. Stimulation of spermatogenesis with recombinant human follicle-stimulating hormone (follitropin alfa; GONAL-f): long-term treatment in azoospermic men with hypogonadotropic hypogonadismMatsumoto AM, Snyder PJ, Bhasin S, Martin K, Weber T, Winters S, et al. · 2009
  15. Anabolic steroid-induced hypogonadism: diagnosis and treatmentRahnema CD, Lipshultz LI, Crosnoe LE, Kovac JR, Kim ED · 2014
  16. The safety of human chorionic gonadotropin monotherapy among men with previous exogenous testosterone useRainer Q, Pai R, Zucker I, Ramasamy R, Masterson TA · 2022
  17. Human chorionic gonadotropin monotherapy for the treatment of hypogonadal symptoms in men with total testosterone > 300 ng/dLMadhusoodanan V, Patel P, Lima TFN, Gondokusumo J, Lo E, Thirumavalavan N, Lipshultz LI, Ramasamy R · 2019
  18. Evaluation and Management of Testosterone Deficiency: AUA GuidelineMulhall JP, Trost LW, Brannigan RE, et al. (American Urological Association) · 2018
  19. The effect of human chorionic gonadotropin (HCG) in the treatment of obesity by means of the Simeons therapy: a criteria-based meta-analysisLijesen GK, Theeuwen I, Assendelft WJ, Van Der Wal G · 1995
  20. Avoid Dangerous HCG Diet ProductsU.S. Food and Drug Administration · 2020
  21. The cycle of the seminiferous epithelium in humans: a need to revisit?Amann RP · 2008
  22. Efficacy of gonadotropin treatment for induction of spermatogenesis in men with pathologic gonadotropin deficiency: a meta-analysisMuir CA, Zhang T, Jayadev V, Conway AJ, Handelsman DJ · 2024
  23. Novarel (chorionic gonadotropin for injection, USP) Prescribing InformationFerring Pharmaceuticals (FDA label / DailyMed) · 2025

Want the deep science?

Read the full Human Chorionic Gonadotropin (HCG) research profile

Every claim on this page traces back to the research database behind Peptide Initiative — studies, citations, clinical trial data, and the technical detail we deliberately left out here.

Open the research profile

More hormones guides

This guide is education, not medical advice. Human Chorionic Gonadotropin (HCG) is a research compound that is not FDA-approved for human use. Talk to a clinician before taking anything.