Why can humans produce Vitamin B from sunlight but not from artificial light sources?
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The kind of light that makes the vitamin B is ultraviolet (UV) light. It’s the same general kind that gives you sunburns.
Artificial lights tend to be in the business of converting as much of the energy they consume into as much light a human can actually see as possible. We can’t see UV light, so artificial lights designed for visible lighting don’t make very much of it.
We can make specialized lamps that are optimized for UV light. You’ll typically find them used in tanning beds. Though I wouldn’t recommend using tanning beds to get your Vitamin B.
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