SPF-lotions prevents vitamin D synthesis and current sunscreen recommendations from the WHO may be re-evaluated.
Not really any big news for reader of this blog. We all know that in order for us to create vitamin D in a natural way, we have to expose our skin to UVB-rays, either from the natural sun or from the lamps in a tanning bed. We also know that sun-protection (SPF) lotions are made to block mainly UVB rays. Therefore it is no big surprise that SPF-lotions also block the creation of vitamin D.
Some researchers in Denmark maybe had their doubts about this logical relationship and set out to prove it. The interesting thing is that they used sun-screen with only SPF 8. Still it blocked almost all UVB. This is a summary of what they found and their conclusion …
The researchers found that thinner sunscreen layers were associated with higher vitamin D serum levels after UVB exposure. However, vitamin D levels did not significantly rise after UVB exposure in those treated with the thickest layer of sunscreen (2 mg/cm²), which is the level recommended by the WHO.
“In this study, we demonstrated that the vitamin D serum level increases in an exponential manner with decreasing thickness of sunscreen layer in response to UVB exposure. To our knowledge, this relation has not previously been described,” the authors write. “Our results suggest that sunscreen use according to the current recommendations by the WHO may be re-evaluated.”
Your can read more about this here … http://www.doctorslounge.com/index.php/news/pb/28609
This means that if you follow my advice in this article about how to tan, you should be good.
Actually the IARC (International Agency for Research on Cancer) stated this in their Monograph Volume 55 from 1992 …
“Chronic exposure, as assessed through occupational exposure, appeared to reduce melanoma risk in three of the large studies, particularly in men; this observation is consistent with the descriptive epidemiology of the condition, which shows lower risks in groups that work outdoors.”
In plain language it means that IARC states that regular, non-burning, UV-exposure reduce the risk for melanoma (and, of course, the risk for vitamin D deficiency). And, thanks to the invention of the tanning lamp that emulates the UV-light in sunshine, it is possible for everyone to achieve this anywhere and at any time. Pity though, that many have become so afraid of tanning beds that they deny themselves this possibility.