Mushroom is a Vegetarian and Vegan source of Vitamin D Vitamin D contributes to normal bone & muscle function Vitamin D contributes to a normal immune system Vitamin D, also known as the sunshine vitamin, is produced by the skin when in contact with sunlight. In the UK, our skin isn't able to make vitamin D from winter sunlight (November to March) as the sunlight hasn't got enough UVB (ultraviolet B) radiation, so dietary sources are required from Meat, oily fish, eggs and fortified foods, making vitamin D vegan supplements even more important. Mushroom is a Vegetarian and Vegan source of Vitamin D Vitamin D contributes to normal bone & muscle function Vitamin D contributes to a normal immune system Vitamin D, also known as the sunshine vitamin, is produced by the skin when in contact with sunlight. In the UK, our skin isn't able to make vitamin D from winter sunlight (November to March) as the sunlight hasn't got enough UVB (ultraviolet B) radiation, so dietary sources are required from Meat, oily fish, eggs and fortified foods, making vitamin D vegan supplements even more important.