Is the Sun a Healthy Source of Vitamin D or Not? Here's What You Need to Know

I've heard some people justify being out in the sun by saying they need some "vitamin D." But with all we know about UV rays, sun damage, and skin cancer, is it really a good idea to get your vitamin D from the sun?

Well, much to my surprise, if you don't have any history of skin cancer in your family, the answer might be yes. Many dermatologists are confirming that if you are vitamin-D-deficient and have no heightened skin cancer risk, the sun can be a good source of vitamin D__in small, metered doses__. I asked Ellen Marmur, M.D., to elaborate.

"I just spent the prime five hours of the day hiking in preparation for Mount Kilimanjaro in July," pale-skinned, auburn-haired Dr. Marmur told me. Outdoor activity is not to be shunned, but "always apply sunscreen from head to toe before you start, and bring extra with you such as a spray or stick for easy reapplication. You will still get plenty of UV [exposure] to convert your [body's own] vitamin D to its active form," she says. Notice that she recommends outdoor activity and not baking on the beach in direct sunlight—that's still a no-no.

Of course, before you look to the sun, supplements, or any other forms of vitamin D, don't assume you need more of it. "Test your vitamin D levels [at the doctor's office]. There are people who have too much vitamin D and become toxic, so always check with your internist before assuming anything," Dr. Marmur says.

Do you know anyone who is actually vitamin-D-deficient? Do you always wear sunscreen when you're going to be outside in the summer?

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