Estriol, coined the “weaker” of the three endogenous estrogens, has significant therapeutic effects, some of which are little known to clinicians. Estriol provides numerous clinical benefits, commanding the attention of researchers dating as far back as 1966 and continues to garner substantial consideration as a valuable and viable therapeutic agent. Some of the most common and effective treatments that employ estriol include: hot flashes, insomnia, skin enhancement, vaginal atrophy and reduced frequency of urinary tract infections. Most recently, estriol has shown the potential to treat individuals with Th1-mediated autoimmune illnesses, including multiple sclerosis and rheumatoid arthritis. This review article will update the clinical effects and benefits of estriol and further clarify the documented advances which support the substantial therapeutic benefits of estriol for autoimmune conditions. The availability of compounded estriol preparations will also be addressed.
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