claim: evidence is used to support vitamin d's role in treatment and prevention.
evidence_1: experts have reached no firm consensus on whether vitamin d can help prevent ms given the lack of clinical trial evidence.", "in contrast to the observational studies, clinical trials have provided little support for the hypothesis that supplemental vitamin d reduces the risk of cvd or cvd mortality.", "finally, nice may be unlikely to recommend vitamin d supplementation on the basis of a trial that has no clear placebo arm.", "no studies have examined whether such screening for vitamin d deficiency results in improved health outcomes.", 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  "however, clinical trials do not support a cause-and-effect relationship between vitamin d and weight loss.")