'Taking the herbal remedy echinacea can more than halve the risk of catching a common cold, US researchers say.
They found it decreased the odds of developing a cold by 58% and the duration of colds by a day-and-a-half.
The results in The Lancet Infectious Diseases conflict with other studies that show no beneficial effect.
Experts believe echinacea, a collection of nine related plant species indigenous to North America, may work by boosting the body's immune system.'
