Elder berry are a powerful antiviral that act on many pathogens (Influenza A and B, cold sores, shingles, Epstein-Barr), and are recommended to fight colds and flu. Clef des Champs organic Elder Berry tonic has been demonstrated that the flavonoids contained in elderberries block the adhesion of viruses to cell receptors, thereby inhibiting the proliferation of viruses. It significantly reduces the length of colds and flu. As an immune regulator, it strengthens the immune system and improves the immune response in both healthy and infected subjects. The anthocyanins in elder berries are an excellent source or antioxidants which help neutralize free radicals and protect cells against oxidative stress, thereby reducing its harmful effects on health.