^Immune System Boosters: Everyday, get Exercise (Stress reliever), Get Outside (Vitamin D + fights against depression) and even, get this – Get Dirty. "Exposure to friendly soil bacteria could improve mood by boosting the immune system just as effectively as antidepressant drugs" and its not just for kids – adults benefit from exercise, dirt, outdoors. Take Zinc. So says Doctor Ken (not a licensed doctor, just a guy who reads way too much)^