Wednesday’s Ask Dr. Walt — Sun Exposure and Vitamin D Toxicity

Dear Dr. Walt,

I spend a lot of time in the sun, especially in the summer. Does this mean my vitamin D levels could get too high?

—Tanned in North Carolina

Dear Sun Seeker,

Nope. According to the American Academy of Dermatology, although spending short periods of time in the sun can usually provide adequate amounts of vitamin D, spending longer periods of time in the sun will not increase vitamin D levels to toxic levels.

This is because excessive exposure to sunlight degrades previtamin D3 (which is normally converted by sunlight into vitamin D3 in the skin) and degrades vitamin D3 itself.

But, it is very possible to get too much vitamin D from supplemental vitamins.

2 thoughts on “Wednesday’s Ask Dr. Walt — Sun Exposure and Vitamin D Toxicity

  1. Sandy

    What happens when/if I get to much Vitamin via supplemental vitamins?

    I take 500 UI each day.

    One of my chiropractors takes 5000 one day, 10,000 the next day, 5000, 10,000 etc.

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