Indeed, some studies have shown increased risk of cancers in relation to using certain vitamins.
How to get all the vitamins you need
Most people should get all the nutrients they need by having a varied and balanced diet, although some people may need to take extra supplements.
Vitamins and minerals, such as iron, calcium and vitamin C, are essential nutrients that your body needs in small amounts to work properly.
Many people choose to take supplements but taking too much or taking them for too long could be harmful.