Vitamin supplements


Dietary supplements, such as over-the-counter multivitamins, do “more harm than good” and can increase the risk of developing cancer and heart disease, according to research in the US.

The study by the University of Colorado, which reviewed several trials involving thousands of patients over a decade, showed that those who took extra vitamins and minerals were more likely to have health problems.

Taking more than the recommended dosage beta carotene – a supplement advertised as a boost to the immune system – was found to increase the risk of developing lung cancer and heart disease by up to 20%, according to the university.

The review also noted that a trial involving a folic acid supplement, which is thought to reduce precancerous polyps in the colon, actually increased the number of polyps among users compared with those who received a placebo.