According to the National Institutes of Health, you need: 15 micrograms (mcg) or 600 International Units (IU) per day for adults aged 19 to 70 20 mcg or 800 IU per day for those 71 and older There ...

4. The sun keeps your bones healthy. That's because your body produces vitamin D when exposed to the sun. The so-called "sunshine vitamin" helps the body absorb calcium, which is essential for ...