Elder-C capsules provide powerful, wild immune support. Obtained from the elder tree (Sambucus nigra), elderberries are dark plum-colored fruit. These berries are accepted therapeutic herbs and have long been used in folk medicines. Their benefits are now being rediscovered by researchers who claim that elderberry juice is highly beneficial for the support of a number of systems in the body. One of the most dramatic benefits is for the immune system. Hemagglutinin protein, found in elderberries, has been shown to support the strength of cells lining the mucous membranes and other cells in the body, thus inhibiting the influenza virus's ability to replaicate.