- 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 …