Enclomiphene
Also known as: Enclomifen, Enclomiphene Citrate, Androxal, trans-Clomiphene, Enclo
The pure active isomer of clomiphene — raises the body's own testosterone via LH and FSH, without the isomer responsible for most of clomiphene's side effects.
Substance family
Selective estrogen receptor modulators. They block the receptor in some tissues while leaving it active in others — which is why they restart the hormonal axis and protect breast tissue without lowering estradiol itself.
Effects on
Which outcomes this substance acts on — descriptive, not a recommendation.
Strain profile
Where this substance is most likely to hit — a rough orientation, individually dependent on dose, duration and predisposition.
This substance works against
Dosing & protocols by goal
Rough orientation ranges as reported in harm-reduction literature — not an individual treatment plan. Doses are individual and open-ended; frequency depends on the ester or half-life.
Restarting the axis (post-cycle)
AdvancedDose
12.5–25 mg / day
Frequency
1× daily
Cycle length
4–6 weeks
Started only once the last esteresterA chemical chain attached to a steroid to slow its release from the injection site. has cleared — use the PCTPCTThe protocol after a cycle intended to restart the body's own testosterone production. timeline to place it. Beginning while active substance still circulates wastes the attempt.
Secondary hypogonadism (off-label)
MedicalDose
12.5–25 mg / day
Frequency
1× daily or every other day
Cycle length
Ongoing, medically supervised
Used off-labeloff-labelUsing an approved drug for a purpose it was not approved for. as an alternative to TRT when preserving fertility matters, since it raises the body's own production instead of replacing it.
Higher doses
AdvancedDose
> 25 mg / day
Frequency
1× daily
Cycle length
—
The LH response saturates. More does not raise testosterone further but does increase side effects.
Side effect & countermeasure
Typical problems and what you can do to reduce harm — at a glance. Does not replace medical monitoring.
Problem
Rising estradiol as testosterone increases
Countermeasure
More of the body's own testosterone means more substrate for aromatase. Measure estradiolestradiolThe main estrogen — needed in men too, and damaging in both directions when out of range. alongside testosterone rather than only tracking the latter; an aromatase inhibitoraromatase inhibitorA drug that blocks the conversion of testosterone to estradiol. is rarely needed here and should not be added preventively.
Problem
Mood changes, though milder than with clomiphene
Countermeasure
Enclomiphene lacks the zuclomiphene isomer responsible for most mood and visual side effects. If they still occur, reduce the dose — the effect on LH is already saturated at low doses.
Problem
Started too early after the cycle
Countermeasure
As long as exogenous substance is still circulating, the axis cannot restart. With long estersestersA chemical chain attached to a steroid to slow its release from the injection site. that means weeks of waiting. Place the start using the ester half-lifehalf-lifeHow long it takes for half the substance to leave the body — it determines dosing frequency, not duration of effect. calculator rather than by the calendar.
Problem
Expecting it to replace a full recovery plan
Countermeasure
Enclomiphene raises LH and FSH but does not repair a testicular apparatus that has been inactive for months. HCG before the recovery phase prepares the testes; the SERMSERMA drug that blocks the estrogen receptor in some tissues while activating it in others. restarts the signal from above.
Problem
Uncertain product quality
Countermeasure
No approved pharmaceutical product exists. Only sources with an independent analysis certificate; underdosed and mislabelled products are common.
Overview
Enclomiphene is one half of clomiphene. Clomiphene as sold is a mixture of two isomers — enclomiphene and zuclomiphene — that behave very differently. Enclomiphene produces the desired effect on the hormonal axis; zuclomiphene is largely responsible for the mood changes and visual disturbances clomiphene is known for, and it stays in the body far longer.
Separating the two is the entire point of this substance. What remains is the effect without most of the baggage.
Mechanism of Action
The hypothalamus measures estrogen levels to decide how much GnRH to release, which in turn determines LH and FSH from the pituitary and ultimately testosterone production in the testes.
Enclomiphene blocks the estrogen receptor at the hypothalamus. The body therefore reads a low estrogen level, concludes that testosterone is insufficient, and increases the signal. LH and FSH rise, and the testes produce more testosterone.
The key distinction from testosterone replacement is that this raises the body's own production rather than supplying hormone from outside. Fertility is preserved, and the axis is not suppressed — which is exactly why it is used after a cycle and as an alternative to TRT in some cases.
Zuclomiphene, the isomer that is absent here, has a half-life measured in days to weeks and accumulates over a course of treatment. That accumulation is the reason clomiphene's side effects often only appear after two or three weeks.
Typical Context
The main application is restarting the axis after a cycle, over four to six weeks at twelve and a half to twenty-five milligrams a day.
Timing determines whether it works at all. As long as exogenous testosterone is still circulating, the hypothalamus continues to read a sufficient level, and no SERM changes that. With a long ester this means several weeks of waiting after the last injection — starting earlier does not accelerate recovery, it wastes the attempt.
A second point is regularly misunderstood. Enclomiphene restarts the signal from above, but it cannot do anything about testes that have been inactive for months and respond poorly. This is the reason HCG is used before the recovery phase rather than during it: first restore the responsiveness of the organ, then restart the signal.
Off-label it is also used as an alternative to TRT, particularly where fertility matters — since replacement therapy suppresses sperm production while enclomiphene does not.
Side Effects & Risks
- Rising estradiol as the body's own testosterone increases
- Mood changes, milder than with clomiphene but possible
- Headache, nausea
- Visual disturbances — rare here, unlike with clomiphene
- No approved pharmaceutical product; quality varies
Blood Work & Monitoring
- LH and FSH — whether the signal is actually rising; the direct measure of effect
- Total/free testosterone — the result of that signal
- Estradiol (sensitive) — rises along with testosterone
- Liver values (ALT, AST, GGT) — as a baseline
Harm-Reduction Notes
- Place the start using the ester half-life calculator, not by the calendar
- Measure estradiol alongside testosterone; do not add an aromatase inhibitor preventively
- Low doses are sufficient — the LH response saturates early
- Not a substitute for a complete recovery plan; HCG belongs before it, not alongside
- Only sources with an independent analysis certificate
- Persistent mood changes are a reason to reduce the dose, not to push through
Legal status by region
Regulation differs considerably between jurisdictions and changes over time. This is a rough orientation, not legal advice — check the rules that apply where you are.
| Region | Regulatory status |
|---|---|
| United States | Not approved for human useSold as a research chemical; marketing for human consumption is unlawful. |
| EU / UK | No marketing authorisationNeither a medicine nor a supplement — no legal route for human use. |
| Most other jurisdictions | Unregulated grey areaPossession is legal in many places precisely because no framework covers it. That is not an indication of safety. |
| Competitive sport | ProhibitedListed by WADA where a relevant class applies. |