Intended for healthcare professionals


Calcium and vitamin D in preventing fractures: Data are not sufficient to show inefficacy

BMJ 2005; 331 doi: (Published 07 July 2005) Cite this as: BMJ 2005;331:108
  1. Alex Vasquez, researcher (,
  2. John Cannell, president
  1. Biotics Research Corporation, 6801 Biotics Research Drive, Rosenberg, TX 77471, USA
  2. Vitamin D Council, 9100 San Gregorio Road, Atascadero, CA 93422, USA

    EDITOR—The study by Porthouse et al had two major design flaws.1 Firstly, the dose of vitamin D (800 IU per day) is subphysiological and therefore subtherapeutic. Secondly, their use of “self report” as a measure of compliance is unreliable.

    The dose of vitamin D at 800 IU daily was not determined …

    View Full Text

    Log in

    Log in through your institution


    * For online subscription