6

votes

Vitamin D production: 10 minutes of exposure, with and without periods of non-exposure

Answered on August 19, 2014
Created January 01, 2012 at 9:09 PM

Hi,

I'm wondering: from a Vitamin-D production point of view, is it the same to :

  • be exposed for 10 total minutes
  • be exposed 10 times for one minute each with some period of non-exposure in between

Thanks

2e98721285a17870271784ea5efeeaf5

(110)

on January 09, 2012
at 10:39 PM

Dragonfly: I also am a Type 4 skin. 10 minutes is also far from being enough for me. However, 10 minutes (each side) feels "OK" in front of my tanning booth. Do you have a similar experience with tanning booths ?

Ca2c940a1947e6200883908592956680

(8574)

on January 02, 2012
at 04:53 PM

Thanks Beth, PaleoHacks ever the useful resource.

Ce41c230e8c2a4295db31aec3ef4b2ab

(32564)

on January 01, 2012
at 11:11 PM

And don't forget the role of complexion. I am Type 4 on the Fitzpatrick Scale and hardly absorb any at all in 10 min.

7dc950fc76a046048e683d2a27dced37

on January 01, 2012
at 10:54 PM

Keep in mind that's their recommendation for 25 micrograms of vitamin D which is ~1000 IU. Those of us who don't live near the equator presumably want more in order to build up stores for the winter.

C4134ed417dbc0a6b79ab2cee32632d3

(1811)

on January 01, 2012
at 10:44 PM

They're really interesting Beth. Apparently, in summer where I live (NE England) if the sky is cloudless, I only need 4 minutes of sun exposure every other day... (I dunno if it's right, but it seems to be a lot less than what's bandied about!)

2e98721285a17870271784ea5efeeaf5

(110)

on January 01, 2012
at 10:06 PM

Thanks for helping me to reword it.

Ca2c940a1947e6200883908592956680

(8574)

on January 01, 2012
at 09:32 PM

A good interesting question to ask, especially if we want to maximise production

Ca2c940a1947e6200883908592956680

(8574)

on January 01, 2012
at 09:32 PM

An good interesting question to ask, especially if we want to maximise production.

4145b36f1488224964edac6258b75aff

(7821)

on January 01, 2012
at 09:21 PM

You may want to reword this. Case 1: you are exposed for 10 total minutes. Case 2: you are exposed for at most one minute. I think you mean to say "be exposed 10 times for one minute each with some period of non-exposure in between"

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1 Answers

best answer

5
7dc950fc76a046048e683d2a27dced37

on January 01, 2012
at 10:23 PM

It depends. Are we talking near the equator? Or New York in January? At some point, the body maxes out on how much D3 can be synthesized, so if you were hitting the limit, then spreading out your exposure to the sun would be helpful. But if you aren't at the limit, it won't matter whether it's one 10-minute session or 10 1-minute sessions.

This PDF -- "Environmental factors that influence the cutaneous production of vitamin D" -- has some useful info. Or you can also check out the Norwegian Institute for Air Research's UV calculator for a specific recommendation for exposure.

7dc950fc76a046048e683d2a27dced37

on January 01, 2012
at 10:54 PM

Keep in mind that's their recommendation for 25 micrograms of vitamin D which is ~1000 IU. Those of us who don't live near the equator presumably want more in order to build up stores for the winter.

C4134ed417dbc0a6b79ab2cee32632d3

(1811)

on January 01, 2012
at 10:44 PM

They're really interesting Beth. Apparently, in summer where I live (NE England) if the sky is cloudless, I only need 4 minutes of sun exposure every other day... (I dunno if it's right, but it seems to be a lot less than what's bandied about!)

Ce41c230e8c2a4295db31aec3ef4b2ab

(32564)

on January 01, 2012
at 11:11 PM

And don't forget the role of complexion. I am Type 4 on the Fitzpatrick Scale and hardly absorb any at all in 10 min.

Ca2c940a1947e6200883908592956680

(8574)

on January 02, 2012
at 04:53 PM

Thanks Beth, PaleoHacks ever the useful resource.

2e98721285a17870271784ea5efeeaf5

(110)

on January 09, 2012
at 10:39 PM

Dragonfly: I also am a Type 4 skin. 10 minutes is also far from being enough for me. However, 10 minutes (each side) feels "OK" in front of my tanning booth. Do you have a similar experience with tanning booths ?

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