I'm overall skeptical of industrial tanning. Anything that damages the skin - which is what you're doing with tanning, little by little - puts you at risk for skin cancer.
However ...
Yesterday I went tanning for the first time. The store advertised their bulbs as providing vitamin D - because they included Ultraviolet B (UVB) radiation.
Afterwards, I had a huge burst of energy. I cleaned my kitchen in 12 minutes. The only biochemical explanation I know for this is the production of vitamin D - basically, the reversal of a vitamin-deficient state. (Actually, a steroid deficiency - because vitamin D is a steroid hormone, not really a "vitamin.")
It made me think of a several-hundred year old trend in English thought - that the sun makes you "mad." Certainly I had enough energy to make me look a bit crazy.
But then again there appear to be multiple positive effects of vitamin D on health.
I think I'm going back.
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