what we already did:
Comparison of immunological effects of commercially successful beta-glucans
Study performed by prof. Vetvicka
Despite the overwhelming number of scientific reports, far too many individual beta-glucans have been used that differ widely in source, solubility, molecular weight, branching and other characteristics. Some of the described glucans show little activity and some have no biological activities. This led us to perform comparative review of six different commercially available and commonly used yeast-derived glucans.
The goal of the study was to test the effects of 14 day glucan oral supplementation on cellular immunity (phagocytosis and nitric acid production), on humoral immunity (IL-2 production and antibody formation) and on reduction of breast cancer. Our results demonstrated that all glucans showed some immunostimulating activity, but there were clear differences in the strength of these effects. As our results showed significant differences among tested glucans, we can conclude that despite the fact that glucans in general have strong stimulating effects on most aspects of the immune system, it is necessary to choose the right glucan.
Full text here