If a little is good… a lot is NOT necessarily better. A 7-year study of more than 35,000 men showed that extra vitamin E can significantly increase your risk of prostate cancer.
The study used a dose of 400 IU a day of vitamin E. More than half of men over age 60 take Vitamin E, with ¼ of those taking at least the amount in the study.
We do not know why too much vitamins can help cause cancer. Maybe it is that antioxidants become carcinogenic (cancer-forming) at high doses.
I heard a cancer doctor say…”consumers should be skeptical about health claims for unregulated over-the-counter products in the absence of strong evidence of benefit from clinical trials.”