Intended for healthcare professionals

Letters Calcium, vitamin D, and risk

Claims do not hold water

BMJ 2011; 342 doi: (Published 07 June 2011) Cite this as: BMJ 2011;342:d3543
  1. James Penston, consultant physician/gastroenterologist1
  1. 1Scunthorpe General Hospital, Scunthorpe, North Lincolnshire DN15 7BH, UK
  1. james.penston{at}

Bolland and colleagues claim that their reanalysis of the Women’s Health Initiative calcium and vitamin D study shows that long term treatment with calcium and vitamin D increases the risk of cardiovascular events in women not taking calcium supplements at randomisation.1 But is this claim supported …

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