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Enclomiphene
Last reviewed: August 27, 2026 by The Peptide Catalog Team
An oral SERM that raises the body's own testosterone by lifting LH and FSH — studied as a fertility-sparing alternative to testosterone therapy. Enclomiphene is the trans-isomer of clomiphene and a selective estrogen receptor modulator (SERM) investigated for raising endogenous testosterone by stimulating the hypothalamic-pituitary-gonadal axis. It reached Phase 3 trials for secondary hypogonadism but is not FDA-approved; vendors sell it as an oral research compound.
Overview
Core Benefits
Key AdvantagesThese are educational summaries of commonly discussed effects in wellness/regenerative contexts, not guarantees.
Enclomiphene Results Timeline
ProgressionTimeline is illustrative and non-guaranteed. Outcomes vary and are commonly discussed alongside training, nutrition, sleep, and cycling practices.
How It WorksSelective Estrogen Receptor Modulator (SERM) — trans-Clomiphene
Target → Signal → Effect → Outcomes
Estrogen Receptors at the Hypothalamus & Pituitary
Enclomiphene is the trans-isomer of clomiphene citrate. It acts as an estrogen-receptor antagonist at the hypothalamus and pituitary — the sites where circulating estrogen (much of it aromatized from testosterone) normally signals the brain to slow down. By occupying those receptors, enclomiphene stops the brain from "seeing" that estrogen feedback.
Released Feedback → More GnRH → LH & FSH
With negative feedback blocked, the hypothalamus increases gonadotropin-releasing hormone (GnRH), and the pituitary responds by releasing more luteinizing hormone (LH) and follicle-stimulating hormone (FSH). Pharmacodynamic work (Wiehle et al., 2013) documented both gonadotropins rising within two weeks of oral dosing.
Endogenous Testosterone Up, Spermatogenesis Preserved
Higher LH drives the testicular Leydig cells to make more of the body's own testosterone, while FSH supports Sertoli-cell function and sperm production. Because the testosterone is produced inside the testis rather than supplied from outside, intratesticular testosterone and spermatogenesis are preserved — the opposite of what exogenous testosterone does (Kaminetsky 2013, Kim 2016).
Bloodwork Shifts Before Sensation
The earliest signs are on labs — rising LH, FSH, and total testosterone — rather than felt effects. Trial subjects reached testosterone levels comparable to testosterone gel over weeks of daily oral dosing. Any energy or libido changes are self-reported by community sources rather than trial endpoints.
What Makes This Peptide Different
Enclomiphene is unusual because it raises testosterone by lifting the body's own signal, not replacing the hormone. Where HCG mimics LH directly at the testis, enclomiphene works one level higher — at the brain — and does so as an oral capsule rather than an injection. It is the isolated trans-isomer of clomiphene, developed to drive the gonadotropin response without the longer-lasting, more estrogenic zuclomiphene fraction that accumulates on clomiphene.
Enclomiphene Vendors
Dosing ProtocolTestosterone Support / Fertility-Sparing (Secondary Hypogonadism)
Educational reference only. Individual responses vary. Consult healthcare provider before use.
Why This Dosing Protocol
Why the isomer matters. Clomiphene citrate is roughly 62% zuclomiphene and 38% enclomiphene. Isolating the trans-isomer was intended to deliver the estrogen-antagonist, gonadotropin-raising effect while avoiding the accumulating zuclomiphene fraction. Enclomiphene completed Phase 3 for secondary hypogonadism but was never FDA-approved.
Storage & Handling
Storage at a glance
Proper storage temperatures, shelf life, reconstitution best practices, and travel tips for lyophilized and reconstituted peptides.
Handling specifics
Educational overview on storage, labeling, and traceability considerations for lab environments. Consult primary literature and vendor documentation for specifics.
- Freezer (-20°C): 1+ year
- Refrigerator (2-8°C): 1-3 months
- Room temperature: 2-3 weeks (emergency only)
- MUST refrigerate at 2-8°C
- 4-week maximum shelf life
- NEVER freeze after reconstitution
- Use bacteriostatic water for multi-dose
FAQ
What is enclomiphene and how does it work?
Enclomiphene is the trans-isomer of clomiphene citrate — a selective estrogen receptor modulator (SERM), not a peptide. It blocks estrogen receptors at the hypothalamus and pituitary, removing the negative feedback that normally holds gonadotropins down. Luteinizing hormone (LH) and follicle-stimulating hormone (FSH) rise, and the testes are stimulated to produce more of the body's own testosterone while keeping sperm production running.
How is enclomiphene different from testosterone therapy?
Testosterone therapy adds hormone from outside and suppresses the body's own LH, which shuts down intratesticular testosterone and can impair fertility. Enclomiphene works in the opposite direction — it raises the upstream signal so the testes make more endogenous testosterone. In two parallel Phase 3 studies (Kim et al., 2016), enclomiphene raised testosterone comparably to testosterone gel while preserving sperm counts the gel reduced.
What is the difference between enclomiphene and clomiphene?
Clomiphene citrate is a mixture of two isomers: zuclomiphene (the longer-lasting, more estrogenic cis-isomer) and enclomiphene (the trans-isomer, an estrogen-receptor antagonist that clears faster). Pharmacokinetic work (Wiehle et al., 2013) describes enclomiphene as the component that drives the gonadotropin and testosterone response, without the accumulating zuclomiphene fraction.
Is enclomiphene FDA-approved?
No. Enclomiphene completed Phase 3 trials for secondary hypogonadism but was never FDA-approved, so no finished pharmaceutical product exists. Research-grade material sold by vendors is labeled for laboratory use only and not for human consumption. This page reports what published trials documented, not medical advice.
How long does reconstituted peptide last?
Once mixed with bacteriostatic water, peptides remain stable for up to 4 weeks when refrigerated at 2-8°C (36-46°F). Unopened powder can last 1+ year in the freezer. Get our complete Storage & Travel Guide.
Is this peptide legal to purchase?
Peptides sold "for research purposes only" are legal to purchase in the US, but are not FDA-approved for human use outside of specific medical applications. Always consult a healthcare provider before use.
New to peptides?
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Enclomiphene Research Articles
Buy Enclomiphene: Price, COA & Cost Per Week
Only 1 vetted Enclomiphene source right now: $79.95 a bottle, $0.11/mg. Codes save up to 10%. COA status and real cost per week.
benefitsEnclomiphene: Raise Testosterone, Keep Fertility
Enclomiphene raised endogenous testosterone while preserving sperm counts in trials — unlike testosterone gel. The Phase 2 and 3 evidence, mapped.
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