What Is Enclomiphene?

Enclomiphene is a non-steroidal selective estrogen receptor modulator (SERM) and the trans-isomer of clomiphene citrate. Unlike clomiphene, which contains both the zuclomiphene (cis) and enclomiphene (trans) isomers, enclomiphene citrate isolates the active trans-isomer — the component responsible for the majority of clomiphene’s effect on the hypothalamic-pituitary-gonadal (HPG) axis.

Enclomiphene works by competitively blocking estrogen receptors in the hypothalamus, which leads to increased gonadotropin-releasing hormone (GnRH) secretion, subsequently stimulating luteinizing hormone (LH) and follicle-stimulating hormone (FSH) release from the pituitary gland. This cascade stimulates endogenous testosterone production in the testes — a mechanism that has made enclomiphene a focus of secondary hypogonadism and testosterone optimization research.

All products are sold strictly for laboratory and research purposes only. Enclomiphene is not approved by the FDA for human consumption.

Enclomiphene Product Specifications

Why Researchers Choose Our Enclomiphene

Who Purchases Enclomiphene for Research?

Enclomiphene is purchased across a broad range of research contexts including:

• Researchers studying HPG axis modulation and gonadotropin secretion
• Endocrinology labs investigating secondary hypogonadism mechanisms
• Researchers comparing enclomiphene with clomiphene citrate isomers
• Testosterone optimization researchers studying SERM-driven LH and FSH stimulation
• Fertility researchers investigating LH and FSH stimulation in male models
• Biohackers running documented hormonal biomarker and testosterone protocols

All purchases are for laboratory and research use only. Enclomiphene is not approved by the FDA for human consumption and is not sold as a dietary supplement or therapeutic product.

How Our Enclomiphene Compares

Frequently Asked Questions — Enclomiphene

• Is enclomiphene legal to buy in the US?

  Yes. Enclomiphene is legal to purchase in the United States for research purposes. It is not a scheduled controlled substance under the DEA Controlled Substances Act. It is not classified as an anabolic steroid or SARM under any current or proposed drug scheduling legislation.

  However, enclomiphene is not FDA-approved for human consumption. The FDA reviewed enclomiphene citrate (under the brand name Androxal by Repros Therapeutics) for secondary hypogonadism treatment but did not grant approval. It cannot be sold as a dietary supplement or marketed with health or performance claims. It must be purchased strictly for legitimate laboratory or scientific research use. Always verify current regulations in your state before ordering.

• What is enclomiphene used for in research?

  Enclomiphene is studied primarily for its role as a selective estrogen receptor modulator (SERM) acting on the hypothalamic-pituitary-gonadal (HPG) axis. Key research areas include:

  • Secondary hypogonadism and HPG axis modulation studies
  • LH and FSH stimulation via hypothalamic estrogen receptor blockade
  • Endogenous testosterone production in testosterone-deficient models
  • Isomer-specific comparison studies between enclomiphene and zuclomiphene
  • Male fertility and spermatogenesis preservation research
  • SERM mechanism comparisons — enclomiphene vs tamoxifen vs clomiphene

  All research use must comply with applicable institutional and regulatory guidelines. Enclomiphene is not approved for any therapeutic application in humans.

• What is the difference between enclomiphene and clomiphene citrate?

  Clomiphene citrate (sold as Clomid) is a racemic mixture containing two distinct isomers in approximately equal proportions:

  • Enclomiphene (trans-isomer): The active isomer responsible for estrogen receptor blockade in the hypothalamus, driving LH and FSH release and subsequent testosterone production. Has a short half-life of approximately 8–12 hours.
  • Zuclomiphene (cis-isomer): A weak estrogenic isomer that accumulates in the body due to its significantly longer half-life (weeks). Associated with estrogen-related side effects observed with clomiphene use.

  By isolating the enclomiphene trans-isomer, researchers can study the HPG axis stimulation mechanism without the confounding estrogenic activity introduced by zuclomiphene accumulation — a key reason enclomiphene has attracted significant research interest as a potentially cleaner alternative to clomiphene citrate.

• How does enclomiphene differ from testosterone replacement therapy (TRT) in research models?

  Enclomiphene and exogenous testosterone address androgen deficiency through fundamentally different mechanisms — a distinction central to much of the current research interest in enclomiphene:

  • Exogenous testosterone (TRT): Replaces testosterone externally. Suppresses the HPG axis via negative feedback, leading to reduced LH and FSH secretion and testicular atrophy over time. Fertility typically impaired during use.
  • Enclomiphene: Stimulates the HPG axis to increase endogenous testosterone production. LH, FSH, and testosterone levels rise simultaneously. Testicular function and fertility preserved during research protocols.

  This mechanistic distinction — specifically the preservation of HPG axis function and fertility markers — is one of the primary reasons enclomiphene is studied as a potential research alternative to exogenous testosterone in hypogonadism models.

• How do I verify the purity of your enclomiphene?

  Every batch of enclomiphene we stock has a corresponding Certificate of Analysis (COA) issued by an independent, US-accredited third-party laboratory. We do not use in-house testing or recycle documentation across batches.

  Each COA includes:

  • HPLC purity percentage confirming compound concentration at 12.5mg/ml
  • Mass spectrometry identity verification confirming the trans-isomer (enclomiphene) molecular weight
  • Isomer ratio confirmation where applicable
  • Batch lot number matching the label on the bottle you receive
  • Laboratory name and contact information for independent verification

  COAs are available for download directly on the product page without requiring an account or prior purchase. If your bottle’s lot number does not match the posted COA, contact us immediately for resolution.

• How fast does enclomiphene ship and what are the delivery options?

  Orders placed before 2pm EST on business days ship the same day. Orders placed after 2pm EST or on weekends ship the next available business day.

  • Standard shipping: 2–4 business days via USPS or UPS depending on destination
  • Express shipping: 1–2 business days, selectable at checkout
  • Overnight delivery: Available on request for qualifying orders

  All orders are shipped in plain, discreet packaging with no product labeling visible externally. A tracking number is emailed immediately upon dispatch. We ship to all 50 US states. International shipping is not currently available.

• What is the shelf life and storage requirement for enclomiphene?

  Enclomiphene solution and powder are stable under correct storage conditions:

  • Solution: Store at room temperature (15–25°C / 59–77°F), away from direct sunlight, heat, and moisture. Stable for up to 24 months under correct conditions. Keep bottle tightly sealed when not in use.
  • Powder: Store in a cool, dry, dark location in a tightly sealed container. Powder form typically maintains stability for 24–36 months when properly stored away from humidity and light.

  Each bottle is labeled with a manufacturing date and expiry date. Do not use the compound after the expiry date printed on the label or stated on the COA.

• Can I buy enclomiphene in bulk quantities?

  Yes. Bulk and wholesale pricing is available for research institutions, private laboratories, and verified researchers requiring quantities above standard catalog listings. Both solution and powder formats are available for bulk ordering.

  Volume discount tiers are applied automatically at checkout for qualifying order sizes. For institutional purchase orders, custom invoicing, or high-volume requirements, contact us directly via the enquiry form with the following details:

  • Required quantity and preferred format (solution or powder)
  • Intended research application or institutional affiliation
  • Preferred delivery timeline and location

  All bulk orders are subject to the same independent third-party verification standards and include full COA documentation for every batch supplied.