Beta 1,3D Glucan manufactured by Transfer Point, Inc., is the highest product purity of active 1,3/1, 6 poly-glucose which is derived from the cell wall of Saccharomyces cerevisiae. This product has no known toxicity. Beta 1,3D Glucan, is a natural extract known for its ability to modulate the immune system for superior performance and balance. Backed by over 50 years of research, it is unlike other immune supplements that simply stimulate or change the immune response in unnatural ways. FeaturesBeta 1,3D Glucan manufactured by Transfer Point, Inc., is the highest product purity of active 1,3/1, 6 poly-glucose which is derived from the cell wall of Saccharomyces cerevisiae. This product has no known toxicity. Beta 1,3D Glucan, is a natural extract known for its ability to modulate the immune system for superior performance and balance. Backed by over 50 years of research, it is unlike other immune supplements that simply stimulate or change the immune response in unnatural ways.