Comments by "" (@jb76489) on "What's inside multivitamin supplements and WHY?" video.

  1. 1:03 one point of clarification, vitamin D is synthesized by the body, it does not come from the sun. The reason you need sun is that without it, the wrong enantiomer of vitamin D would be formed, the bio-inactive form. Light changes the way the precursors twist as they come together forming the bio active enantiomer of vitamin D
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