With the beneficial properties of Elderflower and Elderberry, Dr. Dunner Sambu Wild Grown Elderberry & Elderflower Concentrate is the ideal supplement you want in your medicine bag for boosting your immune system and protecting your body during cold and flu season. No matter how carefully you handle your health, it might not be enough. Normal immune function can be weakened by many factors in life, like stress, lack of sleep, allergies and the time of year. It’s important to give your immune system the support it needs, so Dr. Dunner created Sambu — their tried and tested formula designed to support normal immune response.