![]() Sunshine is healthy, but sunburns can cause premature skin aging and raise your risk of skin cancer ( 18, 19). ![]() However, you should make sure to use sunscreen when staying in the sun for extended periods. If you’re only exposing your face and hands, you will produce much less vitamin D.Īlso, if you stay behind glass or use sunscreen, you will produce less vitamin D - or none at all ( 17). Keep in mind that you need to expose a large part of your body. If you live in an area with abundant sunshine, you can probably get all the vitamin D you need by sunbathing a few times per week. Vitamin D can be produced from cholesterol in your skin when it’s exposed to ultraviolet B (UVB) rays from the sun ( 16). Sunshine Is an Effective Way to Get Vitamin D Calcitriol binds to the vitamin D receptor inside your cells, turning genes on or off. Vitamin D is turned into calcidiol, the storage form of the vitamin, which is then converted into calcitriol, the active steroid form. For example, it promotes the absorption of calcium and phosphorus from your gut ( 14).īut scientists have recently discovered that it also plays roles in other areas of health, such as immune function and protection against cancer ( 15). Vitamin D affects various cells related to bone health. This is similar to how most other steroid hormones work ( 12, 13). When the active form of vitamin D binds to this receptor, it turns genes on or off, leading to changes in your cells. This is the active, steroid-hormone form of vitamin D.Ĭalcitriol interacts with the vitamin D receptor (VDR), which is found in almost every single cell in your body ( 10, 11). Second, it is converted to calcitriol, or 1,25(OH)2D, mostly in your kidneys. Vitamin D needs to undergo two conversion steps to become active ( 8, 9).įirst, it is converted to calcidiol, or 25(OH)D, in your liver. ![]()
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