'No proof' vitamin D stops colds

Scientists say they can find no convincing evidence to show that taking vitamin D supplements will fend off a cold.
A New Zealand team did the "gold standard" of tests - a randomised placebo-controlled trial - to see what impact the supplements would have. The 161 people who took daily vitamin D for 18 months caught as many colds as the 161 who took fake pills. The study was reported in the Journal of the American Medical Association.
But a leading UK cold expert said vitamin D was useful. Prof Ronald Eccles, of the Common Cold Centre at Cardiff University, said it can give the immune system a much-needed boost during winter when vitamin D reserves may be low.

Source  - BBC