What Is Tamoxifen (Nolvadex)?
Tamoxifen citrate (brand name Nolvadex) is a selective estrogen receptor modulator (SERM) that has been used clinically since 1977. It is primarily prescribed for breast cancer treatment and prevention but is widely used off-label in men for post-cycle therapy (PCT), gynecomastia prevention, and testosterone optimization.
How Tamoxifen (Nolvadex) Works
Tamoxifen blocks estrogen receptors in a tissue-selective manner. In breast tissue, it acts as an estrogen antagonist (blocking estrogen effects). In bone, it acts as a partial agonist (preserving bone density). In the hypothalamus, it blocks estrogen negative feedback, increasing GnRH and therefore LH/FSH production, which stimulates endogenous testosterone. Unlike Clomid, tamoxifen does not contain an estrogenic isomer, giving it a cleaner anti-estrogenic profile.
Tamoxifen (Nolvadex) Dosage
For PCT in men: 20 mg/day for 4 to 6 weeks. For gynecomastia prevention during a cycle: 10 to 20 mg/day. For testosterone optimization: 10 to 20 mg/day (lower doses preferred to minimize side effects). Half-life is 5 to 7 days, allowing flexible dosing schedules.
Clinical Evidence
Tamoxifen has one of the most extensive clinical evidence bases of any SERM, primarily from breast cancer research. For male applications, a 2005 study in Fertility and Sterility showed that 20 mg/day tamoxifen increased testosterone by 142% in men with idiopathic oligospermia. A 2013 review in the Journal of Clinical Endocrinology and Metabolism confirmed tamoxifen raises testosterone and improves sperm parameters, though less potently than clomiphene for testosterone elevation.
Tamoxifen (Nolvadex) vs Clomid: How They Compare
Tamoxifen and Clomid are both SERMs that raise testosterone by blocking hypothalamic estrogen receptors. Clomid is generally stronger for testosterone elevation (studies show higher T increases vs tamoxifen at equivalent doses). Tamoxifen has a cleaner side effect profile (no zuclomiphene, fewer visual disturbances, less estradiol elevation) and is more targeted for gynecomastia protection. For maximum testosterone stimulation and fertility, Clomid is preferred. For PCT with minimal side effects and gynecomastia protection, tamoxifen is often chosen. Elite Bio Supply carries pharmaceutical-grade Clomid (100 mg, 30 tablets) and Enclomiphene (50 mg, 5 tablets) for researchers who want the testosterone-raising benefits of SERMs.
Legal Status in Canada
Tamoxifen is a prescription drug in Canada but is not a controlled substance under the CDSA.
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Elite Bio Supply sells research compounds for research purposes only. This content does not constitute medical advice. The information above is based on published clinical literature and is provided for informational purposes. Consult a qualified physician before starting any protocol.