From the Manufacturer: Modern science has identified in Maitake (Grifola frondosa) a proteoglucan, Beta-1,3 glucan and Beta-1,6 glucans combined with protein, as an active constituent to support the immune system.** Maitake D-Fraction is a standardized form of the proteoglucan, specially developed to be optimal for oral administration. Standardized Form of the Proteoglucan. 4X More Proteoglucan than Maitake D-Fraction Standard Capsules.
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