There are three types of UV rays, but the third (UVC) type doesn’t reach the Earth’s surface so it’s not of concern. The two types of UV radiation that reach the Earth’s surface are:
- UVA and
The body only produces vitamin D from UVB rays. UVB rays only penetrate our atmosphere when the sun is above approximately 50° above the horizon.
In the video above I show you how simple it is to type in your city and state on this site to find out what times of day the sun is above 50° where you live during each time of the year.
Check it during the summer time and winter, at least. Find out when the UVB rays stop coming in each day during your summer. And find out when is the last month your area will have UVB rays. Capitalize on the vitamin D nature provides for free. The further you live from the equator, and the less vitamin D you are able to get in your area, the more important it is to take advantage of all the sunshine during these times as you can.
There’s a useful app tracks the sun and determines when you can get vitamin C wherever you are in the world. It’s called dminder.
Since it’s not practical for everyone to optimize their vitamin D intake with their busy schedules and geographical location, most people will probably benefit from supplementing with vitamin D, at least on the days you can’t get any from the sun. Check out our post to learn about 5 reasons why you may be vitamin D deficient.