Normally, you can get all the vitamins and minerals you need through a healthy, balanced diet.
However, sometimes you might need to take extra supplements if you have a particular condition or struggle to get enough of a specific vitamin.
Vitamin D is found in a small number of foods, including oily fish, red meat, egg yolks and fortified foods. But your best bet is to get out in the sunlight or take supplements.
According to the NHS, Brits should be taking vitamin D supplements during the winter.