Role of Phytoestrogens in Endometriosis

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This narrative review examines preclinical and clinical evidence for phytoestrogens—including isoflavones, stilbenes, flavonoids, and curcuminoids—in endometriosis pathophysiology, focusing on effects on estrogen signaling, inflammation, angiogenesis, oxidative stress, and apoptosis. It reports that these compounds can show both estrogenic and anti-estrogenic actions depending on concentration and receptor affinity, with examples like resveratrol, genistein, and quercetin inhibiting aromatase, reducing pro-inflammatory cytokines (e.g., TNF-α, IL-6, COX-2), and suppressing VEGF, leading to reduced lesion growth, less inflammation, and more apoptosis in experimental settings. The authors explicitly note limitations including limited clinical data, concerns about bioavailability, metabolism variability, and possible adverse effects (such as gastrointestinal discomfort or endocrine disruption). This paper is centrally about endometriosis — it reviews the therapeutic potential and mechanisms of action of phytoestrogens in endometriosis.

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Abstract

AIM: To investigate the therapeutic potential of phytoestrogens in the management of endometriosis and to elucidate their mechanisms of action based on current preclinical and clinical evidence. METHODS: This narrative review evaluates recent studies exploring the biological activity of phytoestrogens-specifically isoflavones, stilbenes, flavonoids, and curcuminoids-in relation to endometriosis pathophysiology. Emphasis was placed on their effects on estrogen signaling, inflammation, angiogenesis, oxidative stress, and apoptosis. RESULTS: Phytoestrogens exhibit both estrogenic and anti-estrogenic properties depending on their concentration and receptor affinity. Compounds such as resveratrol, genistein, and quercetin have demonstrated the ability to inhibit aromatase activity, downregulate pro-inflammatory cytokines (e.g., TNF-α, IL-6, and COX-2), and suppress vascular endothelial growth factor (VEGF) expression. These actions contribute to reduced lesion growth, decreased inflammation, and enhanced apoptosis in experimental models. Despite these promising findings, clinical data remain limited, and bioavailability concerns, individual variability in metabolism, and potential adverse effects-such as gastrointestinal discomfort or endocrine disruption-must be carefully considered. CONCLUSION: Phytoestrogens represent promising adjuncts in the treatment of endometriosis due to their multi-targeted molecular actions and relatively favorable safety profile. However, their clinical application requires further validation through randomized controlled trials. Specialist supervision is recommended to ensure optimal dosing, monitor safety, and evaluate interactions with standard hormonal therapies.
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Methods

This narrative review evaluates recent studies exploring the biological activity of phytoestrogens—specifically isoflavones, stilbenes, flavonoids, and curcuminoids—in relation to endometriosis pathophysiology. Emphasis was placed on their effects on estrogen signaling, inflammation, angiogenesis, oxidative stress, and apoptosis.

Results

Phytoestrogens exhibit both estrogenic and anti-estrogenic properties depending on their concentration and receptor affinity. Compounds such as resveratrol, genistein, and quercetin have demonstrated the ability to inhibit aromatase activity, downregulate pro-inflammatory cytokines (e.g., TNF-α, IL-6, and COX-2), and suppress vascular endothelial growth factor (VEGF) expression. These actions contribute to reduced lesion growth, decreased inflammation, and enhanced apoptosis in experimental models. Despite these promising findings, clinical data remain limited, and bioavailability concerns, individual variability in metabolism, and potential adverse effects—such as gastrointestinal discomfort or endocrine disruption—must be carefully considered.

Conclusion

Phytoestrogens represent promising adjuncts in the treatment of endometriosis due to their multi-targeted molecular actions and relatively favorable safety profile. However, their clinical application requires further validation through randomized controlled trials. Specialist supervision is recommended to ensure optimal dosing, monitor safety, and evaluate interactions with standard hormonal therapies. Disclosure The authors have nothing to report. Conflicts of Interest The authors declare no conflicts of interest. Data Availability Statement Data sharing not applicable to this article as no datasets were generated or analyzed during the current study.

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