Indeed, the WCFI notes: “There is strong evidence from randomised controlled trials that high-dose beta-carotene supplements may increase the risk of lung cancer in some people.
“There is no strong evidence that dietary supplements, apart from calcium for colorectal cancer, can reduce cancer risk.”
If you have cancer, Cancer Research recommends that you check with your specialist before you take any supplements to make sure they won’t interfere with any cancer treatment you are having.
“Some vitamins or minerals could interfere with how well cancer drugs work. Antioxidant supplements such as co enzyme Q10, selenium and the vitamins A, C and E can help to prevent cell damage. So some doctors think this might stop chemotherapy working well,” the charity says.