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Saccharomyces cerevisiae beta-glucan

Immunity · Respiratory infections · Natural killer cells
Tier 2 — Promising

What it is

Whole inactivated baker's yeast provides 1,3/1,6 beta-glucans as a natural immune primer. Multiple trials show whole yeast beta-glucans reduce the incidence of colds and upper respiratory infections in active adults by 20 to 30 percent. Also supports natural killer cell activity. Different from probiotic Saccharomyces boulardii — this is inactivated for immune stimulation, not gut colonisation.

Efficacy
3/5
Safety
5/5
Research
2/5
Onset
3/5
Cost
4/5
Drug-int.
5/5

Dose

250–500 mg/day inactivated whole yeast or equivalent 1,3/1,6 beta-glucan; different from S. boulardii

Time of day & tips

Take with water at any time of day. No need for refrigeration. No significant drug or food interactions. Safe to take alongside any supplement or medication.

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