Your body is able to store the vitamin and use it later but the amount of vitamin D your skin makes depends on many factors. Depending on where you live, vitamin D production may decrease or be completely absent during the winter. Vitamin D is naturally available in only a few foods, including oily fish like mackerel and salmon and also found in egg yolks. It is important to make sure you get outside more when the sun is shining and give your skin short bursts of sun without using sun cream. Vitamin D deficiency is very common and is linked to many health disorders so it is worth asking your GP to test you as a supplement may be necessary to bring levels up to optimum.
