Enclomiphene is the trans-isomer of clomiphene, studied for raising natural testosterone production by blocking estrogen's negative feedback on the pituitary, rather than replacing testosterone directly. It reached Phase 3 trials for male hypogonadism (under the name Androxal) but was not brought to FDA approval, and remains available only as a research compound or compounded prescription.
Not the same as clomiphene — a real, relevant distinction
Clomiphene citrate is a mixture of two isomers: enclomiphene (~62%, the trans isomer) and zuclomiphene (~38%, the cis isomer). They behave differently — enclomiphene acts as an estrogen receptor antagonist at the hypothalamus/pituitary (the effect that raises LH/FSH/testosterone), while zuclomiphene acts as an estrogen receptor agonist with a much longer half-life (roughly 30 days, vs. enclomiphene's ~10 hours) — meaning zuclomiphene lingers in the body long after dosing stops. Enclomiphene as sold is the isolated active isomer, without the lingering agonist component.
Benefits
Mechanistically, enclomiphene is responsible for clomiphene's testosterone-raising effect (disinhibiting GnRH pulsatility, raising LH/FSH, stimulating testicular testosterone/sperm production) without zuclomiphene's estrogen-agonist activity along for the ride.
Enclomiphene vs. Clomiphene — side effects
In direct comparison data: overall adverse effects were reported in 13.8% of enclomiphene users vs. 47% of clomiphene users. Decreased libido: 8.6% vs. 33.3%. Reduced energy: 5.2% vs. 16.7%. Mood changes: 0% vs. 9.1% with clomiphene. (These comparative figures weren't independently re-verified against a primary PubMed source in this pass — worth confirming directly before treating them as fully established, though the mechanistic rationale for why enclomiphene would have a cleaner side-effect profile is real and sourced above.)
Is Enclomiphene FDA-approved?+
No. It reached Phase 3 trials under the name Androxal for male hypogonadism but was never granted FDA approval as a standalone product.
How is Enclomiphene different from testosterone therapy?+
It is studied for stimulating the body's own testosterone production via the pituitary, rather than replacing testosterone directly, which is why it comes up in discussions of preserving fertility during a testosterone-support protocol.
Is Enclomiphene the same as Clomid?+
Related but not identical — Clomid (clomiphene citrate) is a mix of two isomers (enclomiphene and zuclomiphene); enclomiphene is the isolated isomer thought to carry most of the testosterone-raising effect.
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