I have been taking AHCC and Beta Glucan as well for about two months, not really soon enough to tell if they are working though. At the Prohealth presentation, Dr. Judy Mikovits suggested that supplements that help NK function might be of help to us, and that there are some that have been through Phase I trials. She didn't mention any names of products but I am pretty sure she was talking about AHCC, which as been through Phase I. I believe it is made with Maitake and Shiitake mushrooms using a proprietary process.
Jerry here is a place you can buy AHCC at a pretty good price:
(It is 2 oz. in bulk, which is 56g--compared to most sources which are 30g in capsules for around $45.)