paper-machine comments on Announcing the Quantified Health Prize - Less Wrong
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See this part, emphasis mine.
UV lamps in tanning beds produce UV light of the right frequency to stimulate vitamin D production. They have to, in order to do what they do.
A trivial Googling shows several sources claiming that tanning beds and lamps generate UVB.
UVB light. See above.
Reasonably large studies have been done on treating rickets, a vitamin D deficiency, with ultraviolet lamps. Unsurprisingly, it works.
Now then, what evidence do you have that 1) we don't know what wavelengths of light stimulate vitamin D production; 2) we can't build lamps that produce those wavelengths; and 3) that the lamps we have do more harm than good.
Consider 3) in the light of the vast advances in curing rickets since the 19th century.