Keeping your immunity high can help prevent you from getting the common cold. Your immune system can kill an invading cold virus. But, if your immune system is weak, the common cold virus can multiply in you, making you sick. Your immune system needs vitamins and minerals to stay strong. Eat a wide variety of colourful fruits and vegetables every day to help keep your immune system strong. Herbs like Astralagus and Oregano oil have been used traditionally to boost immunity. Probiotics are thought to help fight off the common cold too!