Concept
Treatment Effects
Eating well | Canadian Cancer Society / Should you take a vitamin and mineral supplement?
"Research studies have shown that taking higher than recommended doses of some types of vitamins and minerals called antioxidants, such as beta carotene, vitamin C or zinc, may affect how well treatments like radiation therapy and chemotherapy work. Studies also suggest that cancer treatment may not work as well in people who smoke and take antioxidant supplements during treatment. Talk to your healthcare team before taking any vitamin and mineral supplements during treatment."