Here is what a leading research scientist, Dr. Jan Rae, from Norway has to say. 'Beta 1,3/1,6 D-Glucans is truly a miracle of nature. It activates a healthy immune system response. Immune system activation begins with macrophage cells, an important part of your immune system, and it's the first defense against external stresses. Once the macrophages are activated a healthy body calls up the rest of the immune system response. Activating your macrophage cells can naturally result in a total immune response. Beta Glucans with Maitake mushrooms for Healthy Immune Support.Suggested usage, Take 1 capsule 1 to 2 times daily