Elderberries are high in vitamins A and C, and studies show that both these vitamins strengthen the immune system. Elderberries are also high in iron. Fighter cells use iron to produce enzymes and oxidants which digest cold-causing bacteria. Elderberry stimulates the body to eliminate toxins. In this way, elderberries prevent weakening of the immune and respiratory systems because they don't allow conditions of stagnation in which bacteria often thrive.
Elderberries increase perspiration, allowing toxins to be expelled through the skin.
These berries also act as a mild laxative and diuretic, clearing any stagnant conditions of the colon or kidneys. Elderberries help to move excess mucus from the lungs and sinuses, keeping the passages clear and strong. Through scientific research and studies, echinacea has come to be regarded as one of the most promising immune strengtheners in existence. The reason that so many people find this annual herb to be so useful is that it has the ability to fight off infections, colds, flus, strep throat, bronchitis and other immune system disorders. If taken when the first symptoms of a cold or flu surface, echinacea can stop them from progressing further.