Enclomiphene for Men: Low Testosterone, Fertility and TRT

Physician-reviewed men’s hormone education

Enclomiphene for Men: Low Testosterone, Fertility and TRT

Enclomiphene can raise endogenous testosterone in selected men with secondary hypogonadism, but it is not the same as testosterone replacement therapy and it is not FDA-approved for male hypogonadism.

Medically reviewed by Dr. Timothy Mackey
Medical Director · Updated September 2026

What is enclomiphene?

Enclomiphene is the trans-isomer of clomiphene citrate. Clomiphene contains both enclomiphene and zuclomiphene. By blocking estrogen feedback at the hypothalamus and pituitary, a SERM can increase release of gonadotropins—particularly LH and FSH—which can stimulate testicular testosterone production and support spermatogenesis in appropriate men.

Enclomiphene has been studied in men with secondary or functional hypogonadism, especially men with low testosterone and low or inappropriately normal LH. It should not be assumed to work equally well in men with primary testicular failure, where LH may already be elevated and the testes are less able to respond.

Is enclomiphene FDA-approved for low testosterone in men?

No. Enclomiphene is not FDA-approved for treatment of male hypogonadism. The AUA/ASRM male infertility guideline notes that SERMs may be used in selected infertile men with low testosterone, but—unlike hCG for specific male indications—SERMs are not FDA-approved for use in men.

This is an important distinction between evidence of potential benefit and FDA approval for a specific indication. Enclomiphene is not an FDA-approved standalone drug. A compounded preparation is an unapproved drug, which is different from using an FDA-approved medicine such as clomiphene off-label. Discuss the product, sourcing, evidence and monitoring with the prescriber.

Enclomiphene vs TRT: what is the difference?

Can enclomiphene preserve fertility?

Clinical trials found that enclomiphene increased total testosterone, LH and FSH while maintaining sperm concentrations in men with secondary hypogonadism. By contrast, testosterone gel raised testosterone but reduced gonadotropins and sperm production.

That does not mean enclomiphene guarantees fertility. Men who are actively trying to conceive should be evaluated based on semen analysis, reproductive history, LH, FSH, testosterone and the underlying diagnosis. The 2024 AUA/ASRM guideline advises against prescribing exogenous testosterone to men interested in current or future fertility. Adding hCG or a SERM does not remove that concern; evidence for preserving fertility with such combinations is too limited to recommend this approach.

Read our detailed guide to TRT and male fertility and our overview of hCG therapy.

Can enclomiphene be taken with TRT?

This question is common because some clinics market enclomiphene as an adjunct to testosterone. Physiologically, however, exogenous testosterone suppresses the hypothalamic-pituitary signal that enclomiphene is trying to stimulate. The strongest published enclomiphene trials evaluated it as an alternative to exogenous testosterone, not as a routine add-on to ongoing TRT.

There may be individualized circumstances in which a clinician considers a SERM during a transition off testosterone, fertility restoration, or another carefully monitored strategy, but patients should not assume that adding enclomiphene to TRT will reliably maintain LH, FSH, testicular function or fertility.

Who may be a candidate?

A physician may consider a SERM-based approach when a man has symptoms compatible with testosterone deficiency, repeatedly low testosterone, and a pattern suggesting secondary or functional hypogonadism rather than primary testicular failure—particularly when preserving fertility is important.

Evaluation typically includes repeat morning testosterone testing, LH and FSH, medical history, medication review, fertility goals and other testing when clinically indicated. Learn more about low-testosterone testing and physician-led TRT evaluation.

How effective is enclomiphene?

Randomized trials reported increases in serum testosterone with enclomiphene comparable to topical testosterone gel in men with secondary hypogonadism. Unlike testosterone gel, enclomiphene increased LH and FSH and generally preserved sperm concentration. A 2025 systematic review and meta-analysis of randomized trials also found that SERM therapy significantly increased total testosterone, LH and FSH compared with placebo.

Those findings are encouraging, but they do not establish that enclomiphene is the best treatment for every man or that laboratory improvements necessarily translate into identical symptom relief, long-term outcomes or safety compared with FDA-approved testosterone products.

What are possible side effects and monitoring considerations?

SERM therapy can cause adverse effects and should be medically monitored. Reported concerns with clomiphene-class therapy can include headache, mood changes, visual symptoms, gastrointestinal symptoms and changes in estradiol or other laboratory values. Because enclomiphene-specific long-term safety data are more limited than data for established testosterone therapies, treatment decisions should consider both benefits and uncertainties.

Patients should promptly report visual changes, severe headache, chest pain, shortness of breath, significant mood changes or other concerning symptoms.

Enclomiphene vs clomiphene

Clomiphene citrate contains both enclomiphene and zuclomiphene. Enclomiphene isolates the trans-isomer that is primarily associated with the anti-estrogenic hypothalamic-pituitary effect. Although both have been studied for male hypogonadism and fertility-related use, they are not interchangeable from a regulatory, pharmacokinetic or evidence standpoint.

For a deeper comparison, read Enclomiphene vs Clomid.

Frequently asked questions

Does enclomiphene increase testosterone?

In clinical trials of men with secondary hypogonadism, enclomiphene increased total testosterone by increasing LH and FSH signaling to the testes.

Does enclomiphene shut down natural testosterone production?

Its intended mechanism is the opposite: it stimulates endogenous gonadotropin signaling. That differs from exogenous testosterone, which commonly suppresses LH and FSH.

Is enclomiphene the same as TRT?

No. TRT replaces testosterone directly. Enclomiphene attempts to stimulate the body’s own testosterone production.

Is enclomiphene approved by the FDA for men?

No. Enclomiphene is not an FDA-approved standalone drug; compounded enclomiphene has not undergone FDA approval.

Can enclomiphene help men who want children?

It may be considered in selected men because it can raise testosterone without the same suppression of spermatogenesis seen with exogenous testosterone, but fertility evaluation and semen analysis remain important.

Medical sources

• Randomized phase II trial: enclomiphene, testosterone and sperm preservation
• Phase III trials: enclomiphene versus testosterone gel
• 2025 systematic review and meta-analysis of SERMs for male hypogonadism
• AUA/ASRM Male Infertility Guideline

This article is educational and does not provide individualized medical advice. Prescription treatment requires evaluation and monitoring by a licensed clinician.