Elderberry tea is packed with antioxidants! The large amounts of vitamin C, phenolic acids, flavanols, and anthocyanins are the contributing factors to why elderberry has been known to boost your immune system. The ingredients in this tea help prevent and ease cold and flu symptoms, hay fever, sinus infections and even constipation. Elderberry is also high in dietary fiber. It contains 7 grams of fiber per 100 grams of berries. There are 6-35 mg of vitamin C per 100 grams of fruit. The compounds of phenolic acids are powerful antioxidants that help reduce damage from oxidative stress in the body. The anthocyanins,another strong antioxidant provides anti-inflammatory effects.