Experts have warned that taking above the recommended daily dose of over-the-counter vitamins could increase the risk of developing cancer and heart disease by up to 20%.
A 10-year study into the effect of vitamin supplements on thousands of people found they can do “more harm than good”.
The study was led by the University of Colorado Cancer Centre and raises questions about the market for shop-bought vitamins, which was worth an estimated £385m in 2012.
The researchers have urged the public to get their vitamins from a healthy diet rather than pills.
Professor Tim Byers said: “We are not sure why this is happening at the molecular level, but evidence shows that people who take more dietary supplements than needed tend to have a higher risk of developing cancer.”.. see more