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Yeast beta glucan increased immunity

After strenuous exercise, the natural immune capacity of mucous membranes that line the air passageways and digestive tract can deteriorate for up to 24 hours, increasing chances for infection. In the first of two studies, 182 marathon runners took 250 mg of yeast beta glucan per day, or a placebo, for 28 days immediately after a marathon. Compared to placebo, those who took yeast beta glucan had 37 percent fewer cold or flu symptoms overall.

In the second study, 60 men and women took a placebo or 250 mg of yeast beta glucan per day 10 days before attempting a strenuous 50-minute cycling exercise. Two hours after completing the cycling test, compared to placebo, the yeast beta glucan group had 32 percent higher levels of a salivary antibody, signaling the mucous membranes were stronger, and could resist infection better. 

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