Familiar symptoms such as headaches and body aches, sinus and chest congestion, coughing and sneezing, indicate that a cold or flu virus has multiplied significantly and that the body tries to expel it and destroy the affected cells. Over-the-counter medications can only suppress some of the symptoms and often have unwanted side effects. It is best to choose natural health products that stimulate the immune system to allow it to destroy the virus before symptoms become general. Cold & Flu Relief is a unique combination of four potent ingredients, Ester-C®, Andrographis, NAC and Echinacea, which research in humans has confirmed the ability to reduce severity and duration. cold and flu symptoms.