Throughout Asia, medicinal mushrooms and herbs have been in constant use for thousands of years as integral parts of their traditional medical systems. That's probably why maitake and other medicinal mushrooms and herbs are taken mush more seriously by doctors and medical researchers in Asia than their counterparts here in the West.Medicinal mushrooms like maitake have been the subject of intense research and attempts to identify the key compounds responsible for their beneficial effects. This led to the discovery of valuable immune-enhancing compounds like the alpha and beta-glucans found in AHCC, beta-glucan products and Maitake D-fraction products.The Grifron® Maitake D-Fraction® contains the purified and standardized "active ingredient" from Maitake mushroom. Known as a "proteoglucan", this compound has been identified as the primary substance responsible for the potent immune-activating property of maitake mushroom. The safety and effectiveness of maitake has been validated by multiple clinical studies throughout the world. Grifron Maitake contains no alcohol, sugar, yeast, mold, gluten, dairy products, artificial colors, preservatives, pesticides, herbicides or fertilizer residue. Grifron® Maitake D-Fraction® is a great option for anyone seeking robust and scientifically-validated support for their immune system.