According to the study, consuming supplement antioxidants can cause blood vessels in cancer to grow
Taking vitamin or mineral supplements could be feeding tumours and allowing them to grow, suggests new research.
Common antioxidants such as vitamins A, C, and selenium and zinc when taken additionally can all cause blood vessels in cancer to grow.
The discovery has come as a surprise as antioxidants were believed to be protective.
The researchers said that natural levels in food were fine but if people take supplements containing antioxidants as well then the extra amount can fuel tumour growth.