Vitamin D3 Supplementation And Upper Respiratory Tract Infections In A Randomized, Controlled Trial
Notes for this study:
||Cases and %. URTI. Placebo n=360, intervention n=399. Placebo: 276 (76.7%). Intervention: 252 (71.8%). Influenza-like illness. Placebo: 62 (17.2%). Intervention: 62 (15.5%)
|Number of Subjects
In a randomized, double-blind, placebo-controlled trial, 2259 participants who had recently had a colorectal adenoma removed took 1000 IU and 1200 mg of calcium carbonate daily, and 761 completed at least one health diary that provided information about infectious diseases.
There were no notable differences between the groups for reports of upper respiratory tract infections or colds during winter, and there was a small reduction in influenza-like illness. The same was true for all seasons, except the reduction in influenza-like illness was even more doubtful.
The mean vitamin D levels were 25.1 (9.1) in the placebo group and 33.3 (9.9) in the vitamin D group.