A strong Immune system helps to fight infections. Sambucol Extra Defence is a powerful 'non prescriptive' flu treatment. The strongest Sambucol formula yet. Black Elderberries have clinically proven results in reducing cold and flu symptoms. Best of all it's entirely natural and has no known side effects. Sambucol has been clinically shown to cut the length of the flu by 50% with effective scientific trials against Avian (bird) flu and swine flu. The blend of vitamins and minerals in Sambucol Extra Defence are required by the body for the proper functioning of the immune system helping to keep you healthy all year round. Sambucol Extra Defence is a scientifically tested comprehensive formula containing 9 proven ingredients which provide maximum immune support to help keep you healthy all year round and provide energy for when you need it most.