'Probiotics may shorten the length of colds - and make them a less miserable experience. In a study at Tabriz University of Medical Sciences in Iran, 500 volunteers took either a daily probiotic pill or a placebo for at least three months.
The bacteria used in the treatment group were Lactobacillus gasserl, Bifidobacterium longum and Bifidobacterium bifidum, all of which occur naturally in the human gut and have been shown in previous studies to boost immunity.
Researchers found that when the people on probiotics got a cold, they recovered two days more quickly and had fewer serious symptoms than those in the control group.
The researchers also found the probiotics group had higher levels of cells associated with immune system activity.'
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