What is it?Holland & Barrett Vitamin D3 contributes towards the maintenance of normal bones, muscle function and the immune system. When exposed to sunlight, our bodies will naturally make vitamin D3. This process happens when ultraviolet B (UVB) radiation from the sun triggers the 7-dehydrocholesteol to produce D3. Research suggests that everyone over the age of one years should have a daily intake of at least 10µg of vitamin D per day to protect bone and muscle health. Government advice is that everyone should consider taking a daily vitamin D supplement, especially during the autumn and winter. Supports the Normal Function of The Immune System Contributes To the Maintenance of Normal Bones and Muscle Function Suitable For Vegetarians