Enclomiphene
Selective Estrogen Receptor Modulator | Testosterone & Fertility Support
Community Research
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Enclomiphene is the trans-isomer of clomifene citrate, a selective estrogen receptor modulator (SERM) that acts primarily as an estrogen antagonist at the hypothalamus and pituitary. Unlike the racemic mixture clomifene (Clomid), which contains both enclomiphene and the cis-isomer zuclomifene, enclomiphene lacks significant estrogenic agonist activity. This makes it better suited for raising endogenous testosterone through increased LH and FSH secretion without the estrogenic side effects commonly associated with clomifene. It was developed under the trade name Androxal for the treatment of secondary hypogonadism in men but has not yet received FDA approval as a standalone product.
Enclomiphene competitively antagonizes estrogen receptors in the hypothalamus and anterior pituitary, blocking the negative feedback of estradiol on GnRH release. This disinhibition increases pulsatile GnRH secretion, which in turn stimulates the anterior pituitary to release luteinizing hormone (LH) and follicle-stimulating hormone (FSH). Elevated LH drives Leydig cell testosterone synthesis in the testes, while FSH supports Sertoli cell function and spermatogenesis. Because enclomiphene lacks the estrogenic agonist properties of zuclomifene, it provides cleaner HPTA stimulation without paradoxical estrogenic effects on mood, vision, or other tissues.
Molecular Data
Research Indications
Restores endogenous testosterone production in men with secondary hypogonadism by increasing LH and FSH through hypothalamic estrogen receptor antagonism. Phase III trials demonstrated significant testosterone normalization.
Provides a non-suppressive alternative to exogenous testosterone for men seeking to raise testosterone levels while maintaining natural HPTA function and fertility.
Can serve as a standalone alternative to testosterone replacement therapy in appropriate candidates, particularly younger men or those concerned about fertility preservation.
Accelerates recovery of the hypothalamic-pituitary-testicular axis after suppression from anabolic steroids or exogenous testosterone by rapidly increasing LH and FSH output.
Helps restore natural testosterone production to baseline levels faster than unassisted recovery, reducing the hypogonadal window after cycle cessation.
FSH elevation driven by enclomiphene supports Sertoli cell function and spermatogenesis, making it useful for men with oligospermia associated with secondary hypogonadism.
Can be used as a bridge off TRT for men who wish to conceive, maintaining testosterone levels while restoring spermatogenesis.
Dosing Protocols
Enclomiphene is administered orally as a capsule or tablet. It is well absorbed with consistent bioavailability. Take at the same time each day, with or without food. Morning dosing is generally preferred to align with natural hormonal rhythms.
| Goal | Dose | Frequency | Route |
|---|---|---|---|
| Testosterone restoration (conservative start) | 12.5mg | Once daily | Oral |
| Testosterone restoration (standard) | 25mg | Once daily | Oral |
| Post-cycle therapy (standard) | 25mg | Once daily for 4-8 weeks | Oral |
| Post-cycle therapy (aggressive) | 50mg | Once daily for 4-6 weeks | Oral |
| Long-term hypogonadism management | 12.5-25mg | Once daily (ongoing with monitoring) | Oral |
Interactions
What to Expect
Side Effects & Safety
Common Side Effects
- Headache
- Nausea or mild gastrointestinal discomfort
- Hot flashes or flushing
- Mood changes (irritability or emotional sensitivity)
- Fatigue during initial adjustment
Stop Signs - Discontinue if:
- Severe or persistent visual changes (flashes, blurred vision, scotomata)
- Signs of blood clots (leg swelling, chest pain, shortness of breath)
- Persistent severe headaches unresponsive to common analgesics
- Significant mood disturbances or depression
- Jaundice or signs of liver dysfunction
Contraindications
- Known hypersensitivity to clomifene or enclomiphene
- Pre-existing liver disease or significantly elevated liver enzymes
- Active or history of thromboembolic disorders
- Pregnancy or women who may become pregnant (teratogenic risk)
- Primary hypogonadism (testicular failure -- enclomiphene requires functional testes)
- Pituitary tumors or undiagnosed pituitary pathology
Quality Checklist
Good Signs
- White to off-white crystalline powder or uniform capsules/tablets
- Third-party certificate of analysis (COA) confirming identity and purity (>98%)
- HPLC testing verifying enclomiphene (trans-isomer) without significant zuclomifene contamination
- Professional packaging with batch number, expiration date, and proper labeling
- Sourced from a licensed compounding pharmacy or reputable research supplier
Warning Signs
- No COA or third-party testing available
- Product labeled as 'clomifene' or 'clomiphene' rather than specifically 'enclomiphene' (may be racemic mixture)
- Inconsistent capsule fill weight or tablet appearance
Bad Signs
- Discolored, clumped, or visibly degraded powder
- Unusual chemical odor
- No labeling, batch information, or expiration date
- COA shows significant zuclomifene (cis-isomer) contamination indicating racemic product sold as enclomiphene
- Sourced from unverified vendors with no quality documentation
References
- Enclomiphene citrate stimulates testosterone production while preventing oligospermia: a randomized phase II clinical trial comparing topical testosteroneKaminetsky J, Werner M, Engelen S, Gallo L, Levy S, Wiehle RFertility and Sterility (2013)
Enclomiphene citrate 25mg daily raised total testosterone into the normal range while maintaining or improving sperm counts, in contrast to topical testosterone which suppressed spermatogenesis. Demonstrated enclomiphene as a viable alternative to TRT for secondary hypogonadism.
- Enclomiphene, an estrogen receptor antagonist for the treatment of testosterone deficiency in menRodriguez KM, Pastuszak AW, Lipshultz LIExpert Opinion on Investigational Drugs (2016)
Comprehensive review of enclomiphene pharmacology and clinical trial data. Confirmed that enclomiphene normalizes testosterone, LH, and FSH in hypogonadal men while preserving sperm parameters. Highlighted its advantage over racemic clomifene due to absence of estrogenic agonist effects from zuclomifene.
- Oral enclomiphene citrate raises testosterone and preserves sperm counts in obese hypogonadal men, unlike topical testosterone: implications for the FDA's REMS programWiehle RD, Fontenot GK, Wike J, Hsu K, Noonan GP, Nowak A, Goodwin BSJournal of Drug Assessment (2014)
In obese hypogonadal men, enclomiphene 25mg daily significantly increased total testosterone (mean from ~228 to ~420 ng/dL) while preserving sperm concentrations. Topical testosterone by contrast reduced sperm counts. Supports enclomiphene as a fertility-preserving alternative.
- Selective estrogen receptor modulators for the treatment of male infertilityWheeler KM, Sharma D, Kavoussi PK, Smith RP, Natali AAsian Journal of Andrology (2020)
Review of SERMs including enclomiphene for male infertility. Confirmed that SERMs increase gonadotropins and testosterone through hypothalamic estrogen receptor blockade. Noted enclomiphene's advantage of pure anti-estrogenic activity without the mixed agonist/antagonist profile of clomifene.
- Enclomiphene citrate for the treatment of secondary male hypogonadismKim ED, McCullough A, Kaminetsky JExpert Opinion on Pharmacotherapy (2015)
Phase III trial review showing enclomiphene 12.5mg and 25mg daily both significantly increased total testosterone versus placebo in men with secondary hypogonadism. Mean testosterone increases were dose-dependent and sustained over 6 months. LH and FSH were also significantly elevated, confirming the hypothalamic mechanism of action.
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Disclaimer
This information is for educational and research purposes only. Consult a healthcare professional before use.