The evidence is convergent. Multiple independent sources reach the same conclusion, the underlying mechanism is well-characterized, and even the field's most cautious voices treat it as worth doing.
So we now have at least two examples of the potent effects of UVB light exposure to the skin and to the eyes. One involving activation of testosterone and estrogen pathways, as it relates to mating, and another that relates to reducing the total amount of pain that we experience in response to any painful stimuli.
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Native comments, Twitter mentions, and Reddit threads about this claim — surfaced together so the conversation isn't fragmented across platforms.
Bookmarking — the dossier-vs-overview split is the right call. Most of the time I want overview; sometimes I want receipts.
Would love a "what would change this verdict" RSS feed. Sign me up if it exists.
Another set of very impressive effects of UVB light, whether or not it comes from sunlight or from an artificial source, is the effect of UVB light on our tolerance for pain. It turns out that our tolerance for pain varies across the year and that our pain tolerance is increased in longer day conditions. This is occurring via UVB exposure to the skin and UVB exposure to the eyes. Basically what they observed is that even one exposure to UVB light change the output of particular hormones and neurochemicals in the body such as corticotropen hormone and betaendorphins which are these endogenous opioids in order to counter pain and act as a somewhat of a psychological soother also. What they found was that exposure to UVB light increased the release of these beta endorphins.
additionally according to paper again human skin produces beta endorphin in response to uvb exposure these opioid peptides have been shown to result in a feeling of well-being that's why the sun feels so good because you are evolutionarily adapted to be in the sun boosting the immune system oh lest we forget that we have an immune system today uh not uh withstanding all the controversial topics relieving pain promoting relaxation wound healing and cellular differentiation