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A comment on Vitamin D Is a Hormone. Parent comment
UV irradiation converts 7-DHC to pre-D3, but continued exposure to UV-B converts pre-D3 to lumisterol and tachysterol.
As pre-D3 levels fall, lumisterol and tachysterol can be converted back into pre-D3 or shed with dead skin.
Pre-D3 is slowly converted to D3 with heat exposure.
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UV irradiation converts 7-DHC to pre-D3, but continued exposure to UV-B converts pre-D3 to lumisterol and tachysterol.
As pre-D3 levels fall, lumisterol and tachysterol can be converted back into pre-D3 or shed with dead skin.
Pre-D3 is slowly converted to D3 with heat exposure.