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It may well be the sun exposure and not the vitamin D that's good for you https://www.outsideonline.com/podcast/inside-rowan-jacobsen-sunscreen-feature/ https:/

• the__alchemist 1y ago
  Wouldn't surprise me. This is a tough nut to crack because it is likely true, but photo aging and skin cancer are unquestionably true and negative effects of UV exposure.
• xhkkffbf 1y ago
  Certainly vitamin D can't be the one and only molecule that's produced in the human body by a photocatalytic pathway.