Vitamin D helps regulate the amount of calcium and phosphate in the body.
A lack of vitamin D can lead to bone deformities such as rickets in children, and bone pain caused by a condition called osteomalacia in adults.
Government advice is that everyone should consider taking a daily vitamin D supplement during the autumn and winter.
View this leaflet for information on vitamin D supplements.
For more information, visit the NHS website: https://www.nhs.uk/conditions/vitamins-and-minerals/vitamin-d/.