Enclomiphene
The active isomer of Clomid / clomiphene / Clomid · SERM (testosterone stimulation)
What it is
The trans-isomer of clomiphene, used off-label to raise natural testosterone by blocking estrogen feedback at the pituitary — the "raise your test without shutting it down" pitch. The standard alternative offered to younger men who balk at lifetime TRT.
What human evidence shows
It reliably raises LH, FSH and total testosterone while PRESERVING fertility — several decent trials show this, and that combination is genuinely unique versus TRT. What is less proven: whether the raised number translates into the symptomatic benefits men actually want, where trial results are much softer.
Risks
Generally better tolerated than mixed clomiphene (the zuclomiphene isomer carries the mood/visual baggage), but mood changes and rare visual disturbances still occur — any visual symptom means stop. Long-term data is thin. The subtle trap: a higher lab number with unchanged symptoms invites endless dose-chasing.
Legal status
US: never FDA-approved as a standalone (the NDA was rejected) — prescribed via compounding pharmacies, a legal but quality-variable channel.
Evidence base
emerging literature
Strong human evidence: either a phase 3 or 4 trial report alongside review-level evidence, or ten or more randomised controlled trial reports.
- phase 3/4
- 1
- randomised
- 3
- reviews
- 2
- human trials
- 7
Counts are of published papers, not distinct trials, and measure how much research exists — not whether this works or is safe for you.
Research (12)
- Safety and efficacy of enclomiphene and clomiphene for hypogonadal menTransl Androl Urol · 2024
- Enclomiphene citrate for the treatment of secondary male hypogonadismExpert Opin Pharmacother · 2016
- Clomiphene or enclomiphene citrate for the treatment of male hypogonadism: a systematic review and meta-analysis of randomized controlled trialsArch Endocrinol Metab · 2025
- Enclomiphene, an estrogen receptor antagonist for the treatment of testosterone deficiency in menIDrugs · 2009
- Enclomiphene citrate: A treatment that maintains fertility in men with secondary hypogonadismExpert Rev Endocrinol Metab · 2019
- Clomiphene Citrate and Enclomiphene Hydrochloride Exposure Is Associated With Interfrontal Suture Fusion in ZebrafishPlast Surg (Oakv) · 2023
- Oral enclomiphene citrate raises testosterone and preserves sperm counts in obese hypogonadal men, unlike topical testosterone: restoration instead of replacementBJU Int · 2016
- Efficacy of Clomiphene Citrate Versus Enclomiphene Citrate for Male Infertility Treatment: A Retrospective StudyCureus · 2023
- Enclomiphene citrate stimulates testosterone production while preventing oligospermia: a randomized phase II clinical trial comparing topical testosteroneFertil Steril · 2014
- Oral enclomiphene citrate stimulates the endogenous production of testosterone and sperm counts in men with low testosterone: comparison with testosterone gelJ Sex Med · 2013
- British Society of Sexual Medicine: Position Statement for the Potential Use of Enclomiphene in the Treatment of Male HypogonadismWorld J Mens Health · 2026
- Enclomiphene does not alter the postpartum interval of suckled beef cowsJ Anim Sci · 1991
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