The natural killer (NK) cell activity blood test is useful in predicting the prognosis of a cancer patient. The purpose of this in-office, nonrandomized open-label trial was to determine whether four different dietary supplements commonly sold in health food stores and over the Internet, consistently and statistically affected NK cell activity in cancer patients. Thirty-four patients were assigned to one of four groups: Group A was given 1-3g/day of modified arabinoxylane with meals. Group B was given 6000mg/day of coriolus mushroom. Group C was given 4g/day of antigen-infused dialyzable bovine colostrum/whey extract and group D was given 3-6g/day of active hexose correlated compound (AHCC). NK cell activities were assessed before treatment and after an average of 16 weeks of therapy. AHCC was the only supplement that consistently and statistically increased NK cell activity. The average increase was 249%. Modified arabinoxylane statistically increased NK cell activity, but did not consistently help every patient. No side effects were encountered during the study period in any of the four groups. http://findarticles.com/p/articles/mi_m0ISW/is_259-260/ai_n12417488/ The above study says 3-6grams of AHCC a day to improve nk function, wow that can work out to be very expensive. Iherb have a well priced AHCC product 500mg x 30 caps for 18.95, 3 grams a day for a month is $106 and 6 grams a day for a month is $212. To me its not overly expensive but when put on top of everything else i take it really adds up. I did price immunovir at $300 for 10 weeks, so i suppose the price between the two arent that different. Maybe need to start a piggy bank and start saving. There are alot of good studies on AHCC, its on my wish list. I think beating back infections as well as improving nk function are the way to go but its not cheap thats for sure. cheers!!!