Information on harm is missing

doi:10.1136/bmj.b4395

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Gabriele Meyer, professor of clinical nursing research1,
Sascha Köpke, research fellow and senior researcher2

¹University of Witten/Herdecke, 58453 Witten, Germany
²University of Hamburg, Unit of Health Sciences and Education, Hamburg, Germany

Gabriele.Meyer{at}uni-wh.de

We read Bischoff-Ferrari and colleagues’ meta-analysis with astonishment, because it does not consider potential side effects of vitamin D and its toxicity.1 This is further evidence that treatment harms are regularly under-reported, even when the information is accessible in primary …