The National Diet and Nutrition Survey found that around one in six adults in the UK have low levels of vitamin D in their blood.
Signs you may be low in vitamin D include fatigue, bone pain, muscle weakness such as aches and cramps, and mood changes including depression.
Those most at risk of a vitamin D deficiency include infants and children aged less than five years, pregnant and breastfeeding women, people aged over 65 years, people who have limited exposure to sunshine, and people with darker skin.
