Promotes Immune Health Herbal Blend Supplement Echinacea (E. Purpurea) is well-known for its positive actions on the body"s natural defense system. Nature"s Answer strengthens the benefits of Echinacea by combining it with Olive Leaf extract (15% Oleuropin), an herb which has strong immune-enhancing properties. Together, this powerful synergistic formula offers a more advanced level of antioxidant support than single herb supplements. • Vitamin C (as Ester-C), Calcium, Echinacea purpurea (flower, leaf, stem).