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Overview Skin and vitamin D

From the Sun

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Notes on what should be on this page

Number of minutes: vs latitude, season, etc
Suntan oil reduces the reflection - so as to reduce by about 50% the number of minutes needed
Noontime sun
Vitamin D & poorly understood other photo products from UVB
UVB and UVA spectrum
Very little UVB after your shadow is longer than you are
get 1/4 dose needed to get pink skin the next day
There are two natural limits to the amount of vitamin D you can get from the sun: tanning, excess vitamin D is destroyed by the UV (perhaps UVA)
Careful of the sunscreen used - some still do not block UVB. By blocking UVA you will indeed increase the amount of time needed to get a tan, but sill wrinkle the skin due by passing thru the UVB
Careful about use of sunscreen without sunglasses.
Can get vitamin D and a tan in the shade - Shade has an approximate SPF of 3
No UVB (and thus no vitamin D) gets thru window glass - but UVA, which can cause a tan, does pass thru glass
Sometimes high degree of reflection fromm snow and water - decreasing amount of time to get vitamin D or a tan by 30-40%
If sun-burn try Aloe and ??

Lots of UVB or exposed skin did not increase vitamin D generated – Nov 2010

From UV bulbs

Tanning salon

Some Salons have only UVA - thus get a tan WITHOUT any vitamin D being generated in the skin

Reptile bulbs

For less than $100 should be able to setup a UVB bulb and timer made to provide vitamin D for reptiles
Some reptile bulbs are UVA and UVB, while a few are narrowband UVB

Vitamin D bulb for use in the home

For both Sun and UV Bulb

protect the eyes

Ways to increase the amount of vitamin D you get from the sun
Opinion: sun better than UV better than vitamin D

Perhaps the UV radiation from a bulb and the sun can be in limited doses - so that the body gets a chance to repair the damage before the next session.
There are some studies which indicate that the cumulative radiation dose is not the concern - for Xrays, radioactivity, etc, but rather the amount per dose.
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Myth: When your shadow is as long as you are you get NO vitamin D

Standing you get 1/3 as much UVB as UVA when the sun is at 45 degrees
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Lying down you get about 1/2 of UVB as UVA when the sun is at 45 degrees
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CLICK HERE for details

No – 10 minutes per day of sun/UVB is NOT enough


5-10 minutes is enough IF you are near the equator
AND young
  AND not obese
     AND have light skin
      AND it is summer
        AND it is the middle of the day
          AND you have lots of skin exposed to the sun
            AND you are lying down
              AND you are not wearing sunscreen.
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See also VitaminDWiki

See also Web

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Page last modified on 24 June, 2014


List of attached files
ID Name desc uploaded Size Downloads Actions
4057 png UV-ingredient-chart.png 24 June, 2014 by admin 38.17 Kb 276 View Download  
696 png EWG Vitamin A.png Vitamin A 20 Aug., 2011 by admin 72.88 Kb 819 View Download  
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Health Problems and D

  # of studies as of 7/21/14