Note that too much vitamin D is harmful. See the comments at the end.
http://www.eurekalert.org/pub_releases/2012-12/ki-vdc121112.php
Public release date: 13-Dec-2012
Contact: Press Office
Karolinska Institutet
Treating infection-prone patients over a 12-month period with high doses of vitamin D reduces their risk of developing respiratory tract infection – and consequently their antibiotic requirement. This according to a new study by researchers at Karolinska Institutet and Karolinska University Hospital published in the online scientific journal BMJ Open.
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"However, the most important difference is probably due to the fact that our participants had much lower initial levels of vitamin D than those in the New Zealand study," says Dr Anna-Carin Norlin, doctoral student and co-lead author of the study along with Dr Bergman. "There is evidence from previous studies that vitamin D supplements are only effective in patients who fall well below the recommended level, which also suggests that it would be wise to check the vitamin D levels of patients with recurrent infections."
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