HS
HormoneStacks
ancillaryFact Checked

EnclomipheneAlso known as: Enclomiphene Citrate

10 min readUpdated April 2026
Reviewed by:Dr. Joe S. Lancaster, MD(Board-Certified OB-GYN, Hormone & Longevity Specialist)

TL;DR — What is Enclomiphene?

Enclomiphene is the 'good half' of Clomid—a selective estrogen receptor modulator (SERM) that raises testosterone by stimulating the pituitary to release LH and FSH. Unlike TRT, which suppresses the body's hormone production, enclomiphene works with the HPTA to boost natural testosterone while preserving—or even enhancing—fertility. It's increasingly used as a first-line treatment for secondary hypogonadism in younger men, as a TRT alternative for those who want to maintain fertility, or as an adjunct alongside TRT to support pituitary function.

Primary Function: Stimulates natural testosterone production via HPTA; preserves fertility

Legal Status (US): Not FDA-approved as single agent; available from compounding pharmacies

Fast Stats

Half-Life~10 hours
Standard Dose12.5-25mg/day
AdministrationOral (daily)
Onset of Effects2-4 weeks
T Increase200-400 ng/dL typical
Fertility ImpactPreserved/Enhanced

How Enclomiphene Functions in a Stack

The Fertility StackCore or AdjunctThe Longevity StackAlternative to TRT

Mechanism of Action

Enclomiphene is a selective estrogen receptor modulator (SERM)—it blocks estrogen receptors in some tissues while potentially activating them in others. In the hypothalamus and pituitary, enclomiphene acts as an antagonist.

HPTA Stimulation

Normally, estradiol (converted from testosterone) provides negative feedback to the hypothalamus and pituitary, limiting LH/FSH release. Enclomiphene blocks this feedback loop:

  1. Enclomiphene binds estrogen receptors in the hypothalamus
  2. The hypothalamus "thinks" estrogen is low
  3. GnRH pulse frequency increases
  4. Pituitary releases more LH and FSH
  5. Testes produce more testosterone and sperm

Enclomiphene vs Zuclomiphene

Traditional Clomid contains two isomers:

  • Enclomiphene (trans-isomer, ~62%): The "good" isomer; anti-estrogenic, raises T
  • Zuclomiphene (cis-isomer, ~38%): The "bad" isomer; estrogenic, causes side effects

Zuclomiphene has a much longer half-life and accumulates with chronic dosing, causing the visual disturbances, mood issues, and estrogenic symptoms that plague long-term Clomid users. Pure enclomiphene avoids these problems.

How Enclomiphene Raises Testosterone

  • Blocks estrogen feedback at pituitary/hypothalamus
  • Increases LH and FSH release
  • Stimulates testicular testosterone production naturally
  • Maintains or improves sperm production (unlike TRT)

Clinical Evidence

Enclomiphene (as Androxal) completed Phase III clinical trials with positive results, though it was not ultimately approved by the FDA:

  • ZA-304 trial: Mean testosterone increase from 232 to 525 ng/dL at 12.5mg/day
  • ZA-305 trial: Maintained normal testosterone for 3+ years with preserved sperm counts
  • Sperm parameters: Improved or maintained in all trials (unlike TRT)

Protocols and Dosing

Monotherapy Protocol (TRT Alternative)

For men with secondary hypogonadism who want to avoid exogenous testosterone:

  • Starting dose: 12.5mg daily
  • Adjustment: Increase to 25mg if response insufficient at 6 weeks
  • Some protocols: 12.5-25mg every other day works for some men
  • Bloodwork: Recheck total T, free T, LH, FSH at 4-6 weeks

TRT Adjunct Protocol

For men on TRT who want pituitary/fertility support:

  • Dose: 12.5mg daily or every other day
  • Purpose: Maintain some LH/FSH signal to testes
  • Note: Less effective than HCG when HPTA is heavily suppressed

PCT Protocol

For post-cycle therapy after anabolic steroid use:

  • Dose: 25mg daily
  • Duration: 4-8 weeks
  • Often combined with: HCG in first 2-3 weeks to "wake up" testes

Who Responds Best

Enclomiphene works best for secondary hypogonadism (pituitary/hypothalamic origin). If your LH is already high-normal or elevated with low testosterone (primary hypogonadism), enclomiphene will likely not help—your testes are the problem, not your pituitary.

Enclomiphene vs HCG

Both can support fertility during TRT, but they work differently:

Enclomiphene

  • Works at pituitary (stimulates LH/FSH release)
  • Oral—no injections
  • Less effective when HPTA is heavily suppressed
  • Minimal E2 impact

HCG

  • Works directly on testes (bypasses pituitary)
  • Requires injection
  • More reliable for maintaining testicular function on TRT
  • Can increase E2

For men on full TRT doses, HCG is generally more reliable for testicular function. Enclomiphene works better as monotherapy or mild TRT adjunct.

Side Effects and Safety

Pure enclomiphene has a favorable side effect profile compared to Clomid:

Common Side Effects

  • Headache: Usually transient in first 1-2 weeks
  • Hot flashes: Occasional, from estrogen receptor blockade
  • Mood changes: Less common than with Clomid

Visual Disturbances

The visual side effects (blurred vision, floaters, light sensitivity) associated with Clomid are primarily caused by zuclomiphene accumulation. With pure enclomiphene, these are rare. However, if visual changes occur, discontinue use immediately.

Primary Hypogonadism

Enclomiphene will not work if you have primary hypogonadism (testicular failure). If your LH is already elevated with low testosterone, your testes cannot respond to more LH stimulation. In this case, TRT is the appropriate treatment.

Frequently Asked Questions

What is enclomiphene used for?

Enclomiphene is a SERM used to increase testosterone by stimulating LH and FSH release from the pituitary. It treats secondary hypogonadism without suppressing the HPTA, preserving fertility.

What is the difference between enclomiphene and clomid?

Clomid contains two isomers: enclomiphene (active, raises T) and zuclomiphene (estrogenic, causes side effects). Pure enclomiphene provides the testosterone-boosting benefits without zuclomiphene's negative effects.

What is the standard enclomiphene dose?

Typical doses range from 12.5-25mg daily. Most protocols start at 12.5mg and adjust based on bloodwork. Some men respond well to every-other-day dosing.

Can enclomiphene be used with TRT?

Yes, enclomiphene can be added to TRT to maintain pituitary function and support fertility. It is sometimes used as an alternative to HCG for men who want to avoid injections.

How long does enclomiphene take to work?

LH and FSH typically increase within 1-2 weeks. Testosterone increases are usually measurable at 2-4 weeks. Full optimization may take 6-8 weeks.

Bottom Line on Enclomiphene

Enclomiphene is an excellent option for men with secondary hypogonadism who want to raise testosterone naturally while preserving fertility. It provides the benefits of Clomid without the problematic zuclomiphene isomer. It's most effective as monotherapy or a mild TRT adjunct, but for men on full TRT doses, HCG remains more reliable for testicular function. Available from compounding pharmacies as it is not FDA-approved as a single agent.

Medical Disclaimer

This content is for educational purposes only and is not medical advice. Always consult a qualified healthcare provider before starting any hormone therapy or peptide protocol. Never self-prescribe or adjust dosages without professional guidance.