Sambucol Immune Defence Effervescent is a unique immune support formula that combines premium black elderberry, 1000 mg of vitamin C per day, and zinc to help support your immune system in fighting illness and reducing the severity of cold and flu symptoms. It's great for adults who want to support their immune health and get back to their normal routine faster. The effervescent drink is easy to take and tastes great. For best results, take one tablet regularly, at the first sign of a cold or flu, and at times of immune stress. Adults should dissolve one tablet in 250mL of water and consume immediately. Always read and follow the instructions, and if symptoms persist, speak to your health professional. This product contains zinc, which may be dangerous if taken in large amounts or for a long period.