Chole She’ein Bo Sakanah, which the Ramah defines as Choleh Kol Gufo or Nafal Lamishkav (you have to lie down) is allowed to do anything that is Assur Mishum Refuah. Vitamins are probably a Ma’achal Bri’im, though if they had existed at the time of Chazal then Chazal would have most likely extended the Gezeirah to them because they are often crushed.
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