Vitamin D is naturally produced in the skin following exposure to sunlight – in fact, this is mostly the primary source of Vitamin D, not diet. Only a few foods naturally contain Vitamin D – e.g. fatty fish, egg yolks and liver. As a result, especially in the darker winter months, it is easy to become at risk of Vitamin D deficiency.
In the body, Vitamin D is responsible for maintaining normal blood levels of calcium and phosphorus, and for helping to build strong bones. Vitamin D works with other vitamins, minerals and hormones to promote bone mineralisation, and may help support a healthy immune system.