As the leaves change color and the air grows cooler, we enter the much-anticipated season of holiday gatherings. But the dreaded cold and flu season also comes with the joys of fall and winter. No matter how much hand sanitizer we use or how many immune-boosting supplements we take, we all know that sometimes it’s impossible to dodge those pesky seasonal bugs. However, what if there was a natural, effective way to supercharge your immune system and help keep illnesses at bay? Enter contrast therapy.