Vitamin D shows promise against seasonal ‘flu

Increased intakes of vitamin D may reduce the incidence of seasonal ‘flu, according to results of a randomized, double-blind, placebo-controlled trial from Japan.

While the link between vitamin D and colds and ‘flu is not new, researchers led by Mitsuyoshi Urashima from Jikei University School of Medicine state that this has not been tested in rigorous clinical trials.

Writing in the American Journal of Clinical Nutrition, the Japanese researchers report that daily supplements of vitamin D3 reduced the influence of seasonal ‘flu (influenza A) by over 40 per cent.