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Vitamin D from sun - minutes for 1000 IU (wrong in many ways) – April 2019

Estimation of exposure durations for vitamin D production and sunburn risk in Switzerland

Journal of Exposure Science & Environmental Epidemiology (2019)
A. Religi, C. Backes, A. Chatelan, J.-L. Bulliard, L. Vuilleumier, L. Moccozet, M. Bochud & D. Vernez



3X less Vitamin D from the sun if dark skin genes(250 IU)
4X variation between individuals from the same amount of sun (500- 2000 IU)
4X difference in the amount of skin exposed to the sun (500- 2000 IU)
2X? less burn if start with a good level of vitamin D
4X more vitamin D if wear a UV transparent shirt


3X less Vitamin D from the sun if elderly (250 IU)
     text claimed 2X more time for elderly, but chart appears to say less time
4X more vitamin D is actually needed (4,000 IU)

Yes, too much sun can result in sunburn, especially if you have a low level of vitamin D

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

  • 5-10 minutes provides only 1,000 IU ONLY 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
  •         AND you have a healthy Liver
  •          AND no clouds and nor air pollution
  •           AND you have good response to sunshine (4X variation between individuals)

and, from 2009
see wikipage http://www.vitamindwiki.com/tiki-index.php?page_id=1689

Note: The body is aded in repairing skin damage by Vitamin D
It is not know how long the repair takes - minutes, hours, days...
It might be that the damage is repaired in 2 hours

 Download the PDF from Sci-Hub via VitaminDWiki

Following images are for Locrano, 46 degrees latitude and low elevation

Note: This seems to indicate that seniors need far less time in the sun to get 1,000 IU that younger adults,
but their study and others say the opposite



Although overexposure to solar ultraviolet radiation (UVR) is responsible for cutaneous melanoma and epithelial skin cancer and can cause negative health effects such as sunburn, a “little and often” exposure regime is often suggested to produce naturally recommended vitamin D levels, being essential for skeletal health. This study aimed to quantify solar UV doses needed to trigger 1000 International Units (IU) vitamin D doses and, at the same time, producing sunburn in Switzerland. Solar UV erythema irradiance (in mW/m2) measured at four meteorological stations in Switzerland for the period 2005–2017 were used to evaluate effective solar UV radiation producing 1000 IU vitamin D doses in skin phototype II and III individuals. Daily solar UV exposure durations (in minutes) needed to produce vitamin D with limited sunburn risk were estimated while considering mean vitamin D food intake of the Swiss population and seasonal skin coverage. In summer and spring, with 22% of uncovered skin, 1000 IU vitamin D doses are synthesized in 10–15 min of sun exposure for adults. Exposure durations between erythema risk and 1000 IU vitamin D production vary between 9 and 46 min. In winter and autumn, the recommended vitamin D production without sunburn risks often unachievable, since up to 6.5 h of sun exposure might be necessary considering 8–10% of uncovered skin surface. The vitamin D food intake only represented 10% of the recommended vitamin D production and remained unchanged throughout the year. These findings might clarify why vitamin D deficiency is common in Switzerland. Moreover, exposure durations between recommended vitamin D and increased sunburn risk might only differ by few minutes. Without additional oral vitamin D supplementation, daily doses of vitamin D (1000 IU) are not reachable in autumn and winter months in Switzerland.

Created by admin. Last Modification: Saturday April 20, 2019 21:38:45 GMT-0000 by admin. (Version 11)

Attached files

ID Name Comment Uploaded Size Downloads
11784 Lorcano map.jpg admin 17 Apr, 2019 17:19 42.00 Kb 568
11783 Locarno months.jpg admin 17 Apr, 2019 17:18 42.42 Kb 539
11782 Locarno.jpg admin 17 Apr, 2019 17:18 48.77 Kb 607
11777 1000 IU vs sunburn.pdf PDF 2019 admin 16 Apr, 2019 19:33 1.06 Mb 2442
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