Vitamin D is an important vitamin for your health, especially for your skin. Your skin has cells called keratinocytes, which make up the outer layer called the epidermis.These keratinocytes are special because they are the only ones in your body that can turn a precursor called 7-dehydrocholesterol into a form of vitamin D that your body can use.Vitamin D does a lot for your skin — it helps with the barrier function, helps your skin cells grow, and supports the immune system in your skin, which is like a shield against harmful germs.Some studies have found that not having enough vitamin D in your blood is linked to skin problems like eczema and psoriasis, both of which can make your skin dry. Taking vitamin D supplements can also make a big difference in improving symptoms of skin issues like eczema, making the skin less dry and itchy.Research also shows a connection between vitamin D and how moist your skin is. So, keeping your vitamin D levels in check can be good for your skin’s health.