Calcium and vitamin D in preventing fractures: Data are not sufficient to show inefficacyBMJ 2005; 331 doi: http://dx.doi.org/10.1136/bmj.331.7508.108-b (Published 07 July 2005) Cite this as: BMJ 2005;331:108
- Alex Vasquez, researcher (firstname.lastname@example.org),
- John Cannell, president
- Biotics Research Corporation, 6801 Biotics Research Drive, Rosenberg, TX 77471, USA
- 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 …