Quick Answer: Enclomiphene Citrate vs Clomid (Clomiphene Citrate)
Enclomiphene is the purified trans-isomer of clomiphene, the active anti-estrogenic component. Clomid contains both enclomiphene (trans) and zuclomiphene (cis), where zuclomiphene is weakly estrogenic and accumulates with a long half-life. Enclomiphene provides the testosterone-raising benefits of Clomid without the estrogenic side effects, visual disturbances, and mood changes associated with zuclomiphene accumulation.
How They Work: Mechanism Comparison
Clomid is a racemic mixture of two stereoisomers. Enclomiphene (trans-clomiphene) is the active anti-estrogenic isomer that blocks hypothalamic estrogen receptors, removing negative feedback and increasing GnRH, LH, and FSH secretion. Zuclomiphene (cis-clomiphene) is the other isomer, which has weak estrogenic activity and a much longer half-life (30+ days vs 10 hours for enclomiphene). Over weeks of Clomid use, zuclomiphene accumulates and partially counteracts the anti-estrogenic effects, causing elevated estradiol, mood changes, and visual disturbances. Enclomiphene citrate contains only the trans-isomer, eliminating the zuclomiphene accumulation problem entirely.
Head-to-Head Comparison
| Factor | Enclomiphene | Clomid |
|---|---|---|
| Composition | Pure trans-isomer only | Mixture of trans (enclomiphene) + cis (zuclomiphene) |
| Half-Life | 10 hours (no accumulation) | 5 to 7 days (zuclomiphene accumulates for 30+ days) |
| Estrogenic Effects | None (no zuclomiphene) | Yes (zuclomiphene is weakly estrogenic) |
| Visual Side Effects | Not reported in clinical trials | 1 to 5% risk (attributed to zuclomiphene) |
| Mood Effects | Minimal (no estrogenic accumulation) | Mood changes reported (5 to 10%) |
| Testosterone Increase | Normalizes T at 12.5 mg/day in most subjects | Normalizes T at 25 to 50 mg/day |
| Dosing | 6.25 to 25 mg/day | 25 to 50 mg/day |
| Clinical History | Phase III trials (2010s), FDA rejected on CMC issues | Approved since 1967, 55+ years of clinical use |
| Cost (EBS) | $35 CAD (50 mg x 5 tablets) | $50 CAD (100 mg x 30 tablets) |
Clinical Evidence
The key distinction between enclomiphene and Clomid was established in Phase III trials by Repros Therapeutics (ZA-301, ZA-302, ZA-304). These trials showed enclomiphene at 12.5 mg/day normalized testosterone while maintaining sperm parameters, with significantly fewer estrogenic side effects than reported in Clomid literature. A 2014 study by Wiehle et al. in Clinical Endocrinology directly compared enclomiphene to Clomid and found equivalent testosterone elevation with lower estradiol levels in the enclomiphene group, confirming that zuclomiphene was responsible for the estrogenic effects seen with Clomid.
Who Should Choose Enclomiphene?
Enclomiphene is the better choice for men who experienced side effects on Clomid (mood changes, visual disturbances, elevated estradiol), those who want the testosterone-raising benefits of clomiphene without estrogenic accumulation, and researchers studying pure SERM pharmacology without the confounding variable of zuclomiphene. Its shorter half-life also allows for faster protocol adjustments.
Who Should Choose Clomid?
Clomid remains a valid choice due to its 55+ year track record, extensive clinical literature, widespread availability, and lower per-day cost. It is appropriate when the research question does not require isolating the trans-isomer effect, when the researcher is comfortable monitoring estradiol levels, and when cost efficiency over long protocols is a priority.
How to Source Enclomiphene in Canada
Elite Bio Supply carries pharmaceutical-grade Enclomiphene Citrate (50 mg tablets, 5-count) with domestic shipping across Canada via Canada Post. All products are third-party tested for purity and identity. View Enclomiphene product page and order.
Related Guides
- Enclomiphene Dosage Guide
- Enclomiphene Side Effects
- Buy Enclomiphene in Canada
- SERMs for Men: Complete Guide
- Clomid vs Enclomiphene
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Elite Bio Supply sells research compounds for research purposes only. This content does not constitute medical advice. The comparison above is based on published clinical literature and is provided for informational purposes. Consult a qualified physician before starting any protocol.