Open label trial discovers 1,200 IU/day more effective than 400 IU/day in managing influenza in infants

A recent open label trial found that higher doses of vitamin D in infants reduced duration of influenza symptoms.

Vitamin D supplementation reduces risk of colds and flu

Dr. Cannell discusses a recent study that confirmed his hypothesis that vitamin D supplementation reduces the risk of colds and influenza.

Animal study suggests vitamins A and D may relate to the effectiveness of flu vaccines

A recent animal study suggests vitamin A and D deficiency may reduce the efficacy of flu vaccines.

Vitamin D supplementation reduces the risk of respiratory infections, according to study

Another study shows vitamin D reduces the risk of developing respiratory tract infections (RTI).

Did vitamin D help New Zealand during the 1918-19 influenza outbreak?

The 1918-19 influenza pandemic was widespread and deadly. Across the world, influenza affected 500 million people and killed 50 to 100 million.

Study looks at seasonality of vitamin D levels in the United States

Researchers wanted to see if seasonal variation still existed for vitamin D levels in the years after sun avoidance advice and to see if seasonality is changing over time.

Meta-analysis: Vitamin D supplementation may prevent respiratory tract infections

Dr Cannell discusses the latest meta analysis examining 11 randomized controlled trials on vitamin D and respiratory tract infections.

The latest research: Vitamin D for prevention of respiratory infections

Recently, researchers at the Indian Institute of Public Health published a meta-analysis of the research on vitamin D and respiratory tract infections.

Tanning, vitamin D status, and colds

Researchers in the Netherlands administered a two month course of sunbed exposure, only to find the effect on infection during that two months was minimal. Dr Cannell explains the details of the study.

Dear Dr Cannell: Flu season hits early

Influenza kills about 350,000 people in the world, almost all in the winter. Older adults with chronic illnesses are at the highest risk.