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D supplements as well as fish oil were thought promising until studies showed they did not really do what they were advertised to do in supplement form. https:

• vanderZwan 6y ago
  How typical that you get downvoted when you're one of the few here to actually cite a source for your claim. I do wonder though if this is an important caveat though: > among healthy participants. .. since the rest of the discussion resolves around adding supplements to fight shortages. If "healthy" implies not have said vitamin D shortage then that is still a useful study but doesn't disprove the thesis that taking supplements is probably a good idea.