Return to Main PageRitz BW. Natural Med J. 2011;3(1). A review of the available data suggests that AHCC, a fermented mushroom extract, may positively affect immune function, especially natural killer cell-mediated innate immunity.Please enter your email address to gain access. I am a practitioner Don't miss out on exclusive webinars, news, and promotions. Add me to your email list We value your privacy and would never spam you. Submit