There’s lots of products that promise to boost your immune system, and who wouldn’t want that? Well, there’s millions of people with autoimmune diseases, inflammatory diseases, allergies—millions of people whose immune systems may already be a bit too active. I try to make sufferers of seasonal allergies feel better by explaining that having an overactive immune system is not all bad. Individuals with allergies “have a decreased risk for cancer (compared with the general population).” Yes, your immune system may be in such overdrive it’s attacking things left and right, like tree pollen, but that heightened state of alert might also help bring down some budding tumors in the body. So, it’s tricky; we want to boost the part of the immune system that fights infection, while down-regulating the part that results in chronic inflammation. And, mushrooms may fit the bill….