Elderberries contain antioxidants and vitamins that may help to boost the immune system. They have long been a popular choice as a healing agent. Elderberries contain flavonoids that possibly reduce swelling, fight inflammation and boost the immune system. Some scientific research is out there to back up the elderberries' ability to help combat colds/flu. Although I am a passionate believer in the power of natural remedies, I don't hesitate to seek the advice of a medical practitioner if necessary.