ZH version is available. Content is displayed in original English for accuracy.
Advertisement
Advertisement
⚡ Community Insights
Discussion Sentiment
67% Positive
Analyzed from 324 words in the discussion.
Trending Topics
#more#skin#uva#table#uvb#https#don#sunlight#produce#minutes

Discussion (14 Comments)Read Original on HackerNews
Nothing a few pounds of ivermectin can't fix.
/s
https://www.reddit.com/r/interestingasfuck/comments/8iflwh/c...
Because UVB scatters more than UVA (Rayleigh scattering), shade increases the UVB:UVA ratio from 1:1 to about 0.52:0.35 under a shade umbrella, or 0.53:0.37 under a tree. See Table 1 (paywalled, sorry) https://doi.org/10.1016/j.jsbmb.2005.04.039
of course, most that go to a tanning booth care more about looks than health
UVB shouldnt just be legal, it should be mandatory.
The paper says you can produce enough vitamin d to maintain healthy levels from a specific amount of sunlight per day, depending on latitude and skin color.
The original comment suggests that there’s some (very short!) limit beyond which the body is unable to produce more vitamin d, which is very different. I’d be very curious to see sources for that.