A robust immune system is our key defence against winter ills and chills especially during the winter months. Your immune system may need extra help if you are often stressed, not eating a balanced diet, or are low on sleep. When cold and flu season begins prevention is the key. Natural remedies such as Olive leaf extract, Astragalus and Andrographis have powerful anti-viral properties and protect against secondary bacterial infections. Key nutrients such as Zinc, Vitamin C and Echinacea are also essential to strengthen immunity.