Sambucol - Immuno Forte Sugar Free Stay healthy all year round! Sambucol® Immuno Forte Sugar Free is a great tasting liquid with no added sugar containing Black Elderberries added Vitamin C and Zinc which may strengthen the immune system. Black Elderberries contain naturally potent antioxidants called flavonoids. Scientifically tested formula containing proven ingredients which can provide immune support to help keep you healthy all year round. Sambucol contains AndtiVirinTM.