Cold & Flu Remedies for Kids Understanding Children's Cold & Flu Supplements: Benefits and Key Ingredients The immune system is an interactive network of organs, white blood cells and proteins that protect the body from outside invaders. It detects and responds to a wide variety of pathogens, including bacteria, viruses, parasites, worms, and other foreign substances, distinguishing them from our healthy tissue. https://www.nationalnutrition.ca/children-s-supplements/cold-flu.html #Coldandfluremediesforkids