- Comprehensive Analysis of Seasonal and Geographical Variation in UVB Radiation Relevant for Vitamin D Production in Europe
- 4 possible reasons for HIGHER Vitamin D in Northern latitudes
- VitaminDwiki - UV and D contains
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5 studies in both categories UV and Europe - UVB lamp appears to give 2,000 IU/ min. if young, 200 IU/min if senior (founder of VitaminDWiki)
- VitaminDwiki - Iceland and Vitamin D - many studies
Comprehensive Analysis of Seasonal and Geographical Variation in UVB Radiation Relevant for Vitamin D Production in Europe
Nutrients 2022, 14(23), 5189; https://doi.org/10.3390/nu14235189
Tarinee Khanna 1,†, Rasha Shraim 1,2,† , Masa Zarkovic 1,3, Michiel van Weele 4 , Jos van Geffen 4 and Lina ZgagDays lacking UVB to make Vitamin D (winter): 4 to 215 days in Europe
5X difference in peak UVB
Dermal synthesis, following sun exposure, is the main source of vitamin D. This study characterizes ambient UVB radiation relevant for vitamin D production in Europe. A biological weighing function was applied to data from the Tropospheric Emissions Monitoring Internet Service (TEMIS) for 46 capital cities over an 18-year period (2004–2021) to isolate wavelengths relevant for vitamin D production (D-UVB). Cumulative and weighted D-UVB (CW-D-UVB) were calculated to approximate seasonal vitamin D accumulation and diminution. Monthly 25(OH)D concentration measurements were extracted from published reports. All data were analyzed by location and time.
Despite a moderate latitudinal range (35–64° N), we observed large—up to five-fold—regional differences: the highest mean diurnal D-UVB dose of 5.57 kJ/m2 (SD = 3.55 kJ/m2) was observed in Nicosia (Cyprus) and the lowest in Reykjavik (Iceland, 1.16 ± 1.29 kJ/m2).
Seasonal differences in diurnal D-UVB dose were even more pronounced, with a median 36-fold difference between annual peak and trough depending on a location (range: 10- to 525-fold).
The mean duration of “vitamin D winter” was 126 days but varied widely (4 to 215 days).
Monthly CW-D-UVB and 25(OH)D changes were very strongly correlated: the changes in 25(OH)D concentration increased by 12.6 nmol/L for every 100 kJ/m2 increment of CW-D-UVB in population-based studies (r2 = 0.79, p-value = 1.16 × 10−37). Understanding the differences in D-UVB radiation can help understand determinants of vitamin D status and guide region- and season-specific safe and effective sunlight exposure recommendations and vitamin D supplementation guidelines.
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4 possible reasons for HIGHER Vitamin D in Northern latitudes
- Vitamin D fortification of food - especially Finland
- More fish consumption (provided not farmed fish)
- Iceland: fish 91 kg /person annually/ Mainly cod and haddock - which are not farmed
- Paler skin
- Lactase persistence Jan 2020 FREE PDF
- "" It was found that individuals with the genetic LP variant had considerably higher levels of serum 25(OH)D (P < 2 × 10−16"
2 possible reasons for LOWER vitamin D in Northern Latitudes
- Fewer hours of summer UVB
might get UVB from 9 AM to 3 PM near the eqator, vs. 10 AM to 2 PM in mid-latitudes or 11 AM to 1 PM in high latitudes - Less intense UVB
VitaminDwiki - UV and D contains
381 items in UV category see also - Overview UV and vitamin D
- Vitamin D bulb for use in the home - or perhaps office,
- Sun and UV
- Sun and Vitamin D category has
331 items - UV and Vitamin D calculators, Vitamin D from low-cost UVB lamps
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- Ultra-low UV LED added to office desk lamp would add 7 ng to winter Vitamin D levels – RCT Oct 2022
- Seniors get about 4X less vitamin D from the sun or UVB
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VitaminDWiki -
5 studies in both categories UV and Europe This list is automatically updated
- Vitamin D winter lasts from 4 to 215 days in Europe – Dec 2022
- Vitamin D genes vary with UVB in Europe, Africa, Asia – March 2020
- Vitamin D and Sun conference – Germany June 2017
- Light (especially UV) and Health conference – Germany June 2015
- Top UK soccer coach installed vitamin D booths in his club – Dec 2012
UVB lamp appears to give 2,000 IU/ min. if young, 200 IU/min if senior (founder of VitaminDWiki)
Make your own UVB Vitamin D lamp for 40 dollars - Jan 2019
I turn around while in front of it for 3 minutes every day in the winter and have 10 seconds on my face ~ 600 IU
I found that staying still would cause a "sun" burn in <1 minute
I also take 100,000 IU of vitamin D once every 4 days during all seasons
Have eyes closed while the lamp is on - the UVB will damage the eyes
VitaminDwiki - Iceland and Vitamin D - many studies
Vitamin D winter lasts from 4 to 215 days in Europe – Dec 20223734 visitors, last modified 24 Apr, 2024, This page is in the following categories (# of items in each category)Attached files
ID Name Uploaded Size Downloads 18941 Henry UVB bulb.jpg admin 06 Dec, 2022 11.10 Kb 457 18940 UVB Europe chart.jpg admin 06 Dec, 2022 74.15 Kb 423 18939 Days on Winter.jpg admin 06 Dec, 2022 96.55 Kb 437 18938 UVB Europe_CompressPdf.pdf admin 06 Dec, 2022 590.23 Kb 184