Enclomiphene: The Best SERM in 2024?

Have you ever wondered about the revolutionary advancements in the field of reproductive medicine? One such breakthrough is enclomiphene citrate, a compound that has been making waves in the medical community. But what exactly is this compound, and why is it garnering such attention?

Enclomiphene is a non-steroidal estrogen receptor antagonist that is primarily used in the treatment of male hypogonadism, a condition characterized by low testosterone levels. It has shown promising results in restoring normal testosterone levels while maintaining sperm production, a unique feature that sets it apart from conventional testosterone replacement therapies. 

In this guide, we’re going to delve into the potential benefits, side effects, and common applications. For a deeper understanding of other SERMs available, we invite you to check out our comprehensive guide on SERMs.

A brief introduction to SERMs and how they work

What Is Enclomiphene?

At its core, enclomiphene is a selective estrogen receptor modulator (SERM). It is an isomer of the more widely known drug, clomiphene citrate, which is often used in fertility treatments. With a similar chemical structure, enclomiphene is distinguished by its distinct pharmacological properties and potential therapeutic applications.

While both isomers of clomid can be used to treat female infertility, enclomiphene has generated interest for its potential in male hypogonadism. Male hypogonadism is a condition where the body does not produce enough testosterone and affects various aspects of men’s health, such as physical performance, energy levels, and sexual function. Enclomiphene has shown promise in this regard, offering a potential alternative to traditional testosterone replacement therapy (TRT).

Key findings from clinical trials of enclomiphene include:

  • Increased serum testosterone levels in men with secondary hypogonadism
  • Maintenance of sperm concentration and motility
  • Improved symptoms of hypogonadism like sexual function and vitality

Here’s a brief summary of enclomiphene’s benefits in comparison to TRT:

Benefits of EnclomipheneBenefits of TRT
Increased testosterone levelsIncreased testosterone levels
Maintained sperm concentration and motilityNo effect on sperm concentration and motility
Improved symptoms of hypogonadismImproved symptoms of hypogonadism

As you can see, enclomiphene holds the advantage of maintaining sperm concentration and motility, unlike TRT. This is crucial for men who still desire to have children, as TRT has been associated with reduced fertility due to suppression of sperm production.

Understanding the Mechanism of Action of SERMs such as Enclomiphene

Mechanism of Action

A diagram demonstrating how Enclomiphene citrate affects the male body.

Delving into enclomiphene’s mechanism of action, it’s crucial to grasp its role in treating male hypogonadism and infertility. Enclomiphene is a selective estrogen receptor modulator (SERM), which means it’s capable of interacting with estrogen receptors in different tissues. But how does this help treat hypogonadism or infertility?

To comprehend enclomiphene’s therapeutic effects, we first need to explore the hypothalamic-pituitary-gonadal (HPG) axis. This interconnected system governs the body’s reproductive function, and any disruption can have significant consequences. Here’s a quick outline of the HPG axis process:

  1. The hypothalamus releases gonadotropin-releasing hormone (GnRH).
  2. GnRH stimulates the pituitary gland to produce luteinizing hormone (LH) and follicle-stimulating hormone (FSH).
  3. The increase in FSH and LH levels stimulate testosterone production and sperm development in the testicles.

However, problems can arise when there’s excessive estrogen in the bloodstream. Too much estrogen can inhibit the release of GnRH, leading to decreased LH, FSH, testosterone production, and sperm count. This is where enclomiphene comes into play.

Enclomiphene acts as an estrogen antagonist in the hypothalamus and pituitary gland, effectively blocking estrogen’s influence. By doing so, it stimulates GnRH release and ultimately increases LH, FSH, testosterone levels and sperm count. Here’s a summary of enclomiphene’s actions:

  • Estrogen antagonist: Blocks estrogen’s inhibitory effect on the HPG axis.
  • GnRH: Stimulates the release of gonadotropins (LH and FSH) from the pituitary gland.
  • LH and FSH: Increases testosterone secretion and stimulates sperm development.

To summarize, enclomiphene’s mechanism of action revolves around its ability to modulate estrogen’s effects on the HPG axis. By blocking estrogen’s inhibitory influence, enclomiphene ensures the proper function of the HPG axis, ultimately leading to increased testosterone production and improved fertility in men.

A look at the key benefits and uses of Enclomiphene for bodybuilding


Now that you understand how it works, let’s discuss some of the primary benefits and uses of enclomiphene.

1. Treatment of male hypogonadism: One of the major uses of enclomiphene is in the treatment of secondary hypogonadism in men. It’s known to improve testosterone levels by stimulating the pituitary gland to produce more luteinizing hormone (LH) and follicle-stimulating hormone (FSH), which in turn leads to an increase in testosterone production.

  • A study comparing enclomiphene to testosterone gel replacement therapy (TRT) showed that enclomiphene was successful in raising testosterone levels, with fewer side effects compared to TRT.
  • Enclomiphene is considered a more convenient option than testosterone injections, as it’s taken orally rather than through injections.

2. Fertility benefits: Another key benefit of enclomiphene is its ability to improve fertility in men with low sperm counts or poor sperm quality.

  • Unlike TRT with exogenous testosterone, which can decrease sperm production due to suppression of gonadotropin release, enclomiphene, by increasing LH and FSH levels, enhances spermatogenesis.
  • For men with oligozoospermia (low sperm count) or asthenozoospermia (low sperm motility), enclomiphene treatment can significantly increase the chances of natural conception.

3. Safer hormonal management: Enclomiphene is believed to have a better safety profile compared to some other hormonal treatments used in male hypogonadism.

  • While topical testosterone can cause erythrocytosis (increased red blood cell production) and increased risk of cardiovascular events, enclomiphene shows positive effects on blood parameters, including hematocrit and hemoglobin levels, and it appears to have minimal effects on the cardiovascular system.
  • Additionally, enclomiphene doesn’t negatively affect testicular size, preserving Leydig cell function and allowing normal testosterone production to occur.

4. Improved quality of life: Last but not least, enclomiphene has been found to have a positive impact on the quality of life for those using it for male hypogonadism treatment.

  • One study showed that men treated with enclomiphene report better energy levels, improved libido, and enhanced cognitive function.
  • By boosting testosterone levels without the side effects of traditional testosterone supplementation, enclomiphene strikes a balance of efficacy and safety, giving its users an overall better experience.

How does Enclomiphene compare to Clomid?

Enclomiphene vs Clomid

Comparing Enclomiphene vs Clomid: Which SERM is best?

Enclomiphene and Clomiphene (clomid) are both selective estrogen receptor modulators (SERMs). They function by blocking estrogen receptors in the hypothalamus, increasing the release of gonadotropin-releasing hormone (GnRH). This stimulates the production of follicle-stimulating hormone (FSH) and luteinizing hormone (LH), leading to ovulation. However, there are distinct differences between the two.

Enclomiphene is actually an isomer of clomiphene, specifically the trans-isomer. This means it is one of two forms that clomiphene can exist in, with the other being cis-clomiphene. Researchers found that enclomiphene is primarily responsible for the ovulation-inducing properties, while cis-clomiphene possesses more estrogenic properties. As a result, enclomiphene presents a more targeted treatment for infertility.

Some key benefits of enclomiphene compared to clomiphene include:

  • Reduced side effects, since it doesn’t contain the estrogenic isomer cis-clomiphene
  • A shorter half-life, leading to faster clearance from the body
  • More consistent follicle development and ovulation rates

In clinical trials, enclomiphene has shown promising results compared to clomiphene:

Ovulation Rates77-78%71-72%
Ongoing Pregnancy Rates30%28-30%

While these findings are encouraging, it’s important to note that further research is needed to confirm the long-term safety and efficacy of enclomiphene.

Our primary focus is on the use of enclomiphene for treating male infertility and increasing production of testosterone. Use in men may have various advantages over traditional treatments like testosterone replacement therapy (TRT). Enclomiphene could maintain fertility, maintain or increase sperm concentration, and potentially reduce side effects typically seen with TRT.

As you can see, enclomiphene and clomiphene share many similarities in their mechanisms of action, but the key differences lie in their chemical structures and effects on the body. Enclomiphene’s targeted approach, reduced side effects, and better performance in clinical trials make it an attractive option for bodybuilders during PCT or men looking to improve sperm count.

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Side effects to look out for during use

Side Effects

When discussing enclomiphene, it’s essential to be aware of potential side effects. As with any medication, the risk for side effects exists, and understanding these risks can help individuals make informed decisions about their treatment.

Nausea and vomiting are common side effects experienced by some individuals taking enclomiphene. While this can be uncomfortable, it’s usually temporary and should improve with time.

Another potential side effect is breast tenderness or discomfort. This may be more common among female users of enclomiphene, but it can also affect male users.

Mood swings or irritability have also been reported by users, so it’s crucial to monitor and manage these emotional changes, especially in the first few weeks of treatment.

Enclomiphene may also cause headaches and dizziness in some cases. If you experience these symptoms, it’s important to let your doctor know, as they may need to adjust your dosage or recommend additional treatments.

More serious side effects, though relatively rare, should be noted:

  • Vision changes: Some users have reported blurred vision, sensitivity to light, or seeing double. If you experience any of these symptoms, contact your healthcare provider immediately.
  • Ovarian hyperstimulation syndrome (OHSS): This mainly affects women taking enclomiphene for fertility treatments. Symptoms include severe pelvic pain, rapid weight gain, and abdominal swelling. If you suspect OHSS, seek medical attention immediately.
  • Ovarian cysts: Enclomiphene has been known to cause the formation of ovarian cysts, especially in women undergoing fertility treatments. Regular monitoring by a healthcare professional can help detect and manage this risk.
Side EffectFrequency
Nausea and vomitingCommon
Breast tendernessCommon
Mood swingsCommon
Headaches and dizzinessCommon
Vision changesRare
Ovarian hyperstimulation syndrome (OHSS)Rare
Ovarian cystsRare

Obviously everyone reacts differently to medications, and you may not experience any of these side effects. Nevertheless, by being informed about potential risks, you can better manage your health and communicate with your healthcare provider should any concerns arise.

Enclomiphene Dosage Guidelines


In this section, we’ll discuss some general recommendations and factors to consider when determining the appropriate enclomiphene dosage.

Typical Dosage Range:

Enclomiphene is usually prescribed and used off-label in doses ranging from 12.5 mg to 50 mg per day, taken orally. However, the exact dosage depends on various factors, such as the individual’s age, health condition, and response to the medication. Some common dosages include:

  • 12.5 mg daily
  • 25 mg daily
  • 50 mg daily

To help you better understand these ranges, here’s a simple table:

Daily DosageCommon Use Cases
12.5 mgMild cases, maintenance therapy
25 mgModerate cases, initial response assessment
50 mgSevere cases, not responding to lower dosages

Factors to Consider:

Several factors should be considered when determining the appropriate enclomiphene dosage:

  • Underlying condition: The dosage may vary depending on the specific health condition being treated. For example, individuals with hypogonadism might require a higher dose than those facing infertility issues.
  • Age: Older patients may be more sensitive to the effects of enclomiphene and might require a lower dosage.
  • Response to treatment: It’s crucial to assess the treatment’s effectiveness at different dosages before settling on the most appropriate dose. If the lower dosage does not show significant improvement, the physician might decide to increase the dose.

Adjusting Dosage and Duration:

The duration of enclomiphene treatment can last from several weeks to months, depending on the desired outcome and individual response. It’s essential to monitor the patient’s progress and make necessary adjustments to the dosage or duration of treatment. These adjustments may include:

  • Increasing the dose: If the lower dosage isn’t effective, it may be necessary to increase the dosage while carefully monitoring the patient for any adverse effects.
  • Decreasing the dose: If the patient experiences side effects or achieves the desired outcome on a higher dosage, the dose can be lowered as part of maintenance therapy or to minimize adverse effects.

Remember, it’s important to always follow the guidance of a healthcare professional when determining the most appropriate enclomiphene dosage.

Enclomiphene PCT dosage

Monitoring treatment with Enclomiphene

Blood Testing

When undergoing treatment with enclomiphene, it’s essential to closely monitor the therapy process to ensure its effectiveness and prevent any potential side effects. We’ll discuss some important aspects of monitoring enclomiphene treatment, including regular blood tests, ultrasounds, and possible adjustments to dosage.

One vital aspect of enclomiphene treatment monitoring is regular blood tests. These tests assess hormone levels, including testosterone and estrogen levels. Monitoring hormone levels helps us determine the treatment’s effectiveness and if any dosage adjustments are needed. It’s typical to conduct blood tests before initiating treatment and continue during therapy at regular intervals, as determined by your healthcare provider.

Test TypePurposeFrequency
TestosteroneAssess testosterone levelsRegular intervals during treatment
EstrogenMonitor estrogen levelsRegular intervals during treatment

Another crucial component of treatment monitoring is the use of ultrasounds. Ultrasounds help identify any changes in testicular volume, which can be an indicator of enclomiphene’s effectiveness. They also allow us to monitor the size of varicoceles (if present), ensuring they’re not negatively impacting sperm production or causing discomfort in the testes.

Adjusting the dosage of enclomiphene is often necessary during treatment, based on your body’s response to therapy. Changes in hormone levels, improvements in semen parameters, and any emerging side effects can help determine if a dosage adjustment is required. Always follow the guidelines provided by your healthcare provider to ensure the best outcome from enclomiphene treatment.

To further support treatment monitoring, it’s important to:

  • Keep a consistent medication schedule, making sure to take your prescribed dosage at the same time each day.
  • Communicate with your healthcare provider regularly, updating them on any changes in your overall health or concerns related to enclomiphene treatment.
  • Maintain a healthy lifestyle, including regular exercise and a balanced diet.

In summary, monitoring enclomiphene treatment involves:

  • Regular blood tests to assess hormone levels
  • Ultrasounds to monitor testicular volume and varicoceles
  • Possible adjustments to dosage based on treatment response
  • Open communication with your healthcare provider
  • Maintaining a healthy lifestyle

Closely monitoring your enclomiphene treatment is a vital step in ensuring the therapy’s success and preventing any possible complications. Through a combination of blood tests, ultrasounds, and open communication with your healthcare provider, you can maximize the benefits of enclomiphene therapy and support your journey toward improved fertility.

Important precautions and contraindications


When it comes to enclomiphene, there are several important precautions and contraindications that we need to keep in mind before using it. The first thing to consider is allergies. If you’re allergic to clomiphene or any of the other ingredients in the tablet, it’s best to avoid enclomiphene. Moreover, be sure to discuss any other allergies you may have with your healthcare provider.

Enclomiphene isn’t recommended for use in pregnant women as it may harm the unborn baby. While using enclomiphene, it’s important to ensure that you’re not pregnant through appropriate testing. In the same vein, women should not breastfeed while taking enclomiphene, as it’s unclear whether the substance passes into breast milk and may have potential risks to the baby.

It’s essential to consider your medical history before taking enclomiphene. Conditions such as thyroid disorders, adrenal gland problems, ovarian cysts, liver diseases, or uterine fibroids might be contraindications. We strongly suggest discussing your medical history with your healthcare provider to understand whether enclomiphene is safe for you to use.

In terms of interactions with other medications, enclomiphene may affect the way your thyroid hormone levels are regulated. Therefore, if you’re on any thyroid medications, it’s important to let your healthcare provider know. Some possible interactions may require dose adjustments or changes in your medication to ensure compatible treatment.

Keep track of any side effects you may experience while on enclomiphene. Common side effects include hot flashes, headache, dizziness, and nausea. However, you should be aware of potentially serious side effects like blurred vision, sudden severe headaches, or shortness of breath and report them to your healthcare provider immediately.

Moreover, while on enclomiphene treatment, it’s crucial to attend all the necessary follow-up appointments with your healthcare provider for regular monitoring. This helps ensure a safe and effective treatment experience.

In summary, enclomiphene has several precautions and contraindications that should be considered:

  • Allergies to clomiphene or other ingredients in the tablet
  • Pregnancy and breastfeeding
  • Prior medical history, including thyroid disorders, adrenal gland issues, ovarian cysts, liver diseases, and uterine fibroids
  • Interactions with thyroid medications
  • Possible side effects
  • Regular follow-up appointments with your healthcare provider

Always consult with your healthcare provider before starting enclomiphene to determine if it’s the right treatment option for you.

Useful research and clinical trials done on Enclomiphene

Clinical Trials

Significant research and clinical trials have been conducted on enclomiphene. To understand its efficacy, safety, and applications more comprehensively, let’s examine a few noteworthy studies:

  • Repros Therapeutics study: In a multi-center, randomized, double-blind Phase 2 trial, 173 men received either enclomiphene or the traditional therapy, clomiphene, for 10 months. Primary endpoints were changes in serum total testosterone and sperm count. Results demonstrated enclomiphene’s ability to significantly raise testosterone levels while maintaining sperm count.
GroupChange in TestosteroneChange in Sperm Count
ClomipheneIncreased slightlyDecreased
  • Transatlantic study: This study examined 120 men treated for 4 months with 12.5 mg of enclomiphene in a single-blind trial. Men treated with enclomiphene had serum total testosterone significantly increased to within the normal range, while maintaining sperm count.
  • Similarity in mechanism to clomiphene: While enclomiphene displays similarities in mechanism to clomiphene, it’s found to be more potent in raising testosterone levels and maintaining sperm count.
  • Metabolic effects: Another study investigated enclomiphene’s metabolic effects on overweight men suffering from secondary hypogonadism, establishing a potentially beneficial effect on insulin resistance.

The above findings consistently demonstrate enclomiphene’s effectiveness in treating low testosterone levels while maintaining sperm count.

However, it’s essential to consider some of the limitations and concerns surrounding enclomiphene research:

  • Limited data: As with many emerging treatments, long-term data on enclomiphene’s effectiveness, safety, and side effects are limited.
  • FDA approval: Enclomiphene is not yet approved by the US Food and Drug Administration (FDA).
  • Off-label usage: While off-label usage of enclomiphene is increasing, it’s crucial to consult a healthcare professional before considering treatment.

In summary, growing evidence indicates enclomiphene’s potential as an effective and safe treatment option for low testosterone levels and secondary hypogonadism. Nevertheless, further long-term research and FDA approval are necessary factors to take into account.


What is Enclomiphene and how does it work?

Enclomiphene is a selective estrogen receptor modulator (SERM) that raises the levels of testosterone, follicle-stimulating hormone, and luteinizing hormone in the body. It works by blocking the activity of estrogen receptors in the body and increasing the levels of follicle-stimulating hormone (FSH) and luteinizing hormone (LH). This can also increase your testosterone levels while keeping your sperm count intact.

What are the potential uses of Enclomiphene?

Enclomiphene is a potential treatment for female infertility and male hypogonadism, a condition in which the body doesn’t produce enough testosterone or sperm. It can also help increase lean body mass.

What is the difference between Enclomiphene and Clomiphene?

Both Enclomiphene and Clomiphene are selective estrogen receptor modulators. However, Enclomiphene is a single isomer and an estrogen antagonist, whereas Clomiphene can agonize or antagonize estrogen depending on the target tissue. Also, Clomiphene is FDA-approved for treating female infertility, while Enclomiphene isn’t.

What are the proven benefits of Enclomiphene?

Enclomiphene can stimulate testosterone production, maintain or increase sperm count, potentially treat secondary hypogonadism, be beneficial for female infertility, and increase lean body mass.

What is the recommended dosage of Enclomiphene and are there any side effects?

In clinical trials, 12.5 mg to 25 mg Enclomiphene citrate significantly increased testosterone levels in normal men. However, the dosage will depend on various factors such as current estrogen levels, testosterone levels, and past cycles. Side effects reported in the phase II/III trials of this drug are relatively mild, such as elevated estradiol levels, headache, and abdominal discomfort. However, the long-term effects of this drug remain unknown.

Wrapping Up: Enclomiphene’s future for treating infertility and boosting testosterone


We’re nearing the end of our exploration of enclomiphene, but it’s important to look ahead at what the future may hold. As research progresses, we can expect new developments and further understanding of this unique compound.

One aspect we’ll be keeping an eye on is the potential for enclomiphene to treat additional conditions. With its effects on testosterone levels, it could be applied to new hormonal therapies. Some possible applications include:

  • Male hypogonadism
  • Muscle wasting conditions

Enclomiphene may offer alternatives or even improvements to existing treatments. Emphasis should be placed on further studies and clinical trials to ensure its safety and efficacy.

As enclomiphene continues to make its mark, we should also consider the possible off-label applications. Evidence of its broader potential is just beginning to emerge, though it’s too early to draw definite conclusions. We hope that researchers will investigate these potential uses further.

Area of ApplicationCurrent Evidence
Fertility PreservationPromising
Age-related testosterone declinePreliminary data

Finally, we can’t stress enough the importance of staying informed about enclomiphene. We encourage you to keep up to date with the latest research and developments in this field. We’ll be doing our part by providing new insights and updates as they emerge.

In wrapping up, we believe enclomiphene’s future is promising, with potential applications that could improve the quality of life for many individuals. Through continued research and a clear focus on understanding its properties, we can continue to unlock its potential.

Research Citations and Literary References

[1] Cunningham, Pitteloud, Wike, Hsu, Fontenot, Rosner, … & Podolski (2013). Testosterone restoration using enclomiphene citrate in men with secondary hypogonadism: a pharmacodynamic and pharmacokinetic study. BJU Int, 8(112), 1188-1200.

[2] Nelson, Barnes, Wiehle, Fontenot, Hoenen, White (2016). Clomiphene and Its Isomers Block Ebola Virus Particle Entry and Infection with Similar Potency: Potential Therapeutic Implications. Viruses, 8(8), 206.

[3] Singh, Kumari (2020). Comparison of fertility rates of combination of enclomiphene citrate and melatonin with fertility rates of plain enclomiphene citrate in cases of dysovulatory infertility. Int J Reprod Contracept Obstet Gynecol, 4(9), 1700.

[4] Rodriguez, Pastuszak, Lipshultz (2016). Enclomiphene citrate for the treatment of secondary male hypogonadism. Expert Opinion on Pharmacotherapy, 11(17), 1561-1567.

[5] Gupta, Khanna (2018). Clomiphene citrate: the changing landscape. Int J Basic Clin Pharmacol, 8(7), 1437.

[6] Ramasamy, Armstrong, Lipshultz (2015). Preserving fertility in the hypogonadal patient: an update. Asian J Androl, 2(17), 197.

[7] Dasgupta (2016). Infographics. BJU Int, 1(119), 1-1. h

[8] Kim, McCullough, Kaminetsky (2015). Oral enclomiphene citrate raises testosterone and preserves sperm counts in obese hypogonadal men, unlike topical testosterone: restoration instead of replacement. BJU Int, 4(117), 677-685.

[9] Ghobadi, Gregory, Crewe, Rostami-Hodjegan, Lennard (2008). CYP2D6 is Primarily Responsible for the Metabolism of Clomiphene. Drug Metabolism and Pharmacokinetics, 2(23), 101-105.

[10] Seif-Barghi, Tavana, Amini (2022). Medical Treatment in Men with Infertility Can Be Misinterpreted as Doping Practice: A Case of Unintentional World Anti-doping Agency (WADA) Code Violation. Asian J Sports Med, 4(13).

Chris Jackson
Chris Jackson

Chris Jackson, co-founder of Sarms.io, is a renowned fitness blogger, physique model, and evolutionary bioscience researcher specializing in SARMs (Selective Androgen Receptor Modulators). His extensive work, characterized by cutting-edge research and practical training advice, has made Sarms.io a leading source for accurate, credible information on performance enhancers. With a dedication to improving the understanding and application of SARMs in optimizing human performance, his contributions have not only expanded public awareness but also shaped the conversation around these substances. Chris's pursuit of knowledge and commitment to sharing it continue to inspire many in their fitness journeys.

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