Vitamin supplements low-risk, but few rewards



July 25, 2018 - 11:00 PM

To Your Good Health

Dear Dr. Roach: I read your recent column on vitamin C. I am 88 years old, and my family and I have taken supplemental vitamins most of our lives. Five years ago, I was diagnosed with prostate cancer and survived it with radiation treatments and a change of diet. I had taken a handful of vitamins every day for years, including 400 IU of vitamin E. My doctors told me that my prostate cancer probably was caused by taking too much vitamin E.

My sister took a handful of vitamins every day and recently died from liver cancer. I believe her liver cancer was caused from vitamin toxicity, too, but the family is not talking about it, so I don’t know for sure. I have stopped taking vitamins altogether and instead rely on a healthier diet, but am considering going back to taking a low-dose multivitamin or just vitamin C and a heart-healthy fish oil. What is your opinion? — E.O.

Answer: A large randomized, controlled trial published in 2011 showed that 200 IU daily of vitamin E by itself increased the risk of prostate cancer. There were about two extra cases of prostate cancer per year found per 1,000 men taking the vitamin E (9.3 cancers per 1,000 men per year on placebo, 10.9 cancers per 1,000 men per year of men taking vitamin E). The risk is low, but since there has been no significant benefit from vitamin E shown, it is not recommended.

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