NOW Foods Extra Strength Beta-Glucans with ImmunEnhancer is a unique combination formula that helps promote immune system health. Beta-Glucans are bioactive carbohydrates derived from the cell wall of Saccharomyces cerevisiae, commonly known as bakers' yeast. This formula features ImmunEnhancer, a proprietary extract of Larch arabinogalactin, which is known to help support healthy NK cell activity in response to environmental stressors. This exceptional combination of immune supporting ingredients helps to fortify a healthy immune response seasonally and throughout the year.