2

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Altitude & Vitamin D Winter

Answered on August 19, 2014
Created October 25, 2011 at 4:59 PM

I moved to Boulder a few weeks ago, and we're right on the 40th parallel. I've read that for 40-degree latitudes there's a "Vitamin D Winter" from November through February (a time where the sun doesn't rise high enough in the sky for us to synthesize D in the skin). However, people I've met say it's possible to get a sunburn even in the middle of winter just walking around the city, apparently due to the altitude (5500' above sea level). If you can get a sunburn, wouldn't it stand to reason that you could make Vitamin D? I've read that there's more UVB/Vitamin D production at higher altitudes, so I'm wondering:

Can being at a higher altitude extend Vitamin D production through the winter?

7dc950fc76a046048e683d2a27dced37

on October 25, 2011
at 10:14 PM

Thanks ... sorry 'bout that!

Ce41c230e8c2a4295db31aec3ef4b2ab

(32564)

on October 25, 2011
at 08:24 PM

This link worked: http://zardoz.nilu.no/~olaeng/fastrt/VitD-ez_quartMED.html

Ce41c230e8c2a4295db31aec3ef4b2ab

(32564)

on October 25, 2011
at 08:23 PM

This link worked: http://zardoz.nilu.no/cgi-bin/olaeng/VitD-ez_quartMED.cgi

Ce41c230e8c2a4295db31aec3ef4b2ab

(32564)

on October 25, 2011
at 08:08 PM

Darn! Couldn't get it to work!

Ce41c230e8c2a4295db31aec3ef4b2ab

(32564)

on October 25, 2011
at 08:07 PM

Really? Then why is altitude part of the calculator? Which I couldn't get to work.

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1 Answers

2
7dc950fc76a046048e683d2a27dced37

on October 25, 2011
at 05:25 PM

Altitude does affect vitamin D production. Here's a calculator you can use to geek out on the details! http://nadir.nilu.no/~olaeng/fastrt/VitD_quartMED.html

Ce41c230e8c2a4295db31aec3ef4b2ab

(32564)

on October 25, 2011
at 08:08 PM

Darn! Couldn't get it to work!

Ce41c230e8c2a4295db31aec3ef4b2ab

(32564)

on October 25, 2011
at 08:24 PM

This link worked: http://zardoz.nilu.no/~olaeng/fastrt/VitD-ez_quartMED.html

7dc950fc76a046048e683d2a27dced37

on October 25, 2011
at 10:14 PM

Thanks ... sorry 'bout that!

Ce41c230e8c2a4295db31aec3ef4b2ab

(32564)

on October 25, 2011
at 08:07 PM

Really? Then why is altitude part of the calculator? Which I couldn't get to work.

Ce41c230e8c2a4295db31aec3ef4b2ab

(32564)

on October 25, 2011
at 08:23 PM

This link worked: http://zardoz.nilu.no/cgi-bin/olaeng/VitD-ez_quartMED.cgi

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