An insoluble fiber that has been isolated from the cell wall of baker’s yeast, beta glucan may help support healthy immune system function. Always committed to superior formulations that just work better, Solaray Beta Glucan is a quality polybranched material that consists of beta 1,3 and 1,6 linkages. Also includes vitamin C, an essential vitamin that helps support antioxidant activity in your body and provides additional healthy immune system support.