DS (4) started preschool in December and has been sick just about every week since. Congestion, runny nose, low grade fever, cough that settles in the chest. He takes 500mg of vit C a day, CLO, coconut oil, udo's for essential fatty acids, a probiotic and a multi. Very limited dairy (yogurt 1-2x a week) too. What else can I try? I've had him to the homeopath twice but something's not clicking and I've tried Wish Garden for Colds and Kids' Insure.