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While the search results don't specifically mention Vitamin E, they highlight an important point about supplements and tamoxifen: Many supplements can interfere with how tamoxifen works in your body. Studies show that 90% of breast cancer survivors take vitamins or supplements, but some can significantly reduce tamoxifen's Show Full Answer

While the search results don't specifically mention Vitamin E, they highlight an important point about supplements and tamoxifen: Many supplements can interfere with how tamoxifen works in your body. Studies show that 90% of breast cancer survivors take vitamins or supplements, but some can significantly reduce tamoxifen's effectiveness. The key issue is that supplements can interfere with liver enzymes (CYP2D6 and CYP3A4) that help convert tamoxifen into its active form, endoxifen. When these enzymes are blocked, tamoxifen becomes less effective at preventing breast cancer recurrence. It's crucial to review ALL supplements with your oncologist before taking them. Due to limited evidence that supplements offer cancer protection - but clear risks of harmful interactions - the American Institute for Cancer Research recommends against using supplements for cancer prevention. Always discuss any supplements, even vitamins, with your healthcare team before taking them.

 AI-generated responses are not a substitute for medical advice. These services are not intended to diagnose, treat, or cure any condition or disease. Always ask your doctor about specific health concerns.

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