Can I make vitamin D driving in my car on a bright, sunny day on my way to work?
No. For one thing, UV radiation doesn't penetrate glass; that's why you can't get a burn or tan if you're driving with your windows closed. (The heat you feel is infrared radiation from the sun, which doesn't have any health impact beyond making you overheated or causing sunstroke if you get an excessive amount.) Even if you're driving in a convertible, though, you probably won't get a good dose of UV-B rays if you're driving in the early morning when the sun is still low in the sky. Talking a stroll during lunchtime is your best bet.
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Tomorrow: Benefits of Sunlight Extend Beyond Vitamin D
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