How is the sun a good source of vitamin d if all you are receiving is photons?
In: Biology
Others have answered the main question, so to answer the obvious follow-up question: no, normal indoor artificial lights do not emit the right frequencies to generate vitamin D. Of course, it’s totally possible for us to make lights that emit those frequencies, and they do sell specialized vitamin D lamps for those with a deficiency.
But the vast majority of us just need indoor lights to see by, and get enough vitamin D as long as we go outside once in a while, so there’s no need to spend a bunch of money to make all our indoor lights like that.
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