The American Association for Cancer Research reports that there is “No Protective Effect on Cancer from Long-Term Vitamin E or Vitamin C Supplementation.” This is in contrast to a study that I wrote about this summer that showed effective treatment of cancer in mice with vitamin C. A significant aspect of the mice study was that they used very high doses, that can only be achieved intravenously. The study the AACR reports on looks at long-term effects of relatively low doses in people. Significantly, they found that over 10 years vitamins E and C “also did not cause any harm.”