Changes in serum 25-hydroxyvitamin D and cholecalciferol after one whole-body exposure in a commercial tanning bed: a randomized study.
Endocrine. 2012 Oct;42(2):430-5. Epub 2012 Mar 6.
Langdahl JH, Schierbeck LL, Bang UC, Jensen JE.
Faculty of Health Science, University of Copenhagen, Copenhagen, Denmark.
We wanted to evaluate the cutaneous synthesis of 25OHD and cholecalciferol after one whole-body exposure to ultraviolet radiation type B (UVB) in a randomized setup. Healthy volunteers were randomized to one whole-body exposure in a commercial tanning bed with UVB emission (UVB/UVA ratio 1.8-2.0%) or an identical placebo tanning bed without UVB. The output in the 280-320 nm range was 450 µW/cm². Blood samples were analyzed for 25OHD and cholecalciferol at baseline and during 7 days after treatment.
We included 20 volunteers, 11 to UVB and 9 to placebo treatment. During the first 6 h, no significant differences in 25OHD between the groups were found. At the end of the study, we found a mean increase of 25OHD in the UVB group of 4.5 nmol/l (SD 7 nmol/l) compared to a decline of -1.2 nmol/l (SD 7 nmol/l) in the placebo group (p = 0.1). A linear mixed model yielded an increase of 25OHD in the UVB group of 1.0 nmol/l per 24 h (p < 0.01). For cholecalciferol, we found a near significant increase of 1 pmol/l per hour in the UVB group compared to the placebo group during the first 6 h (p = 0.052). One tanning bed session had significant, but modest impact on the level of 25OHD during 7 days after exposure to UVB.
Notice: Frequently (but not always) getting just UVA DECREASED the vitamin D levels.
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- UVA destroys Vitamin D in the body (many previous hints of this)
Window glass block most of UVA, but ALL of UVB - thus getting UV thru glass appears to decrease your levels of vitamin D
This may be one of the reasons that truckers live much shorter lives: UVA without UVB ==> lowering of vitamin D levels
- UVA + UVB: net increase in blood levels of vitamin D
- UVB only: larger net increase (a single hint that it might be 6x this has not been confirmed)
Some bulbs have just UVB
- There is a way to block all but UVB:i.e. block UVA and visible and IR (Heat) - see below
- UVA decreased vitamin D levels (again) – July 2013
- Vitamin D from low-cost UVB lamps one bulb has no UVA, just UVB
- Vitamin D from the sun thru a special window or heat shield blocking all but UVB
- UVB produced 8X more vitamin D as solar UV – July 2012
- UVA from some tanning beds and most windows decrease vitamin D blood levels – March 2012
- US truckers die 16 years earlier - partially due to vitamin D deficiency
- UVB added in classroom reduced cavities, increased height, increased academics. etc
- Tanning beds UVB vary by 4X
- All items in category UV and Vitamin D
- Overview UV and vitamin D which has the following
No UVB (Vitamin D) gets thru, but most UVA (Tan) gets thru
- Overview UV and vitamin D which has the following