Quantum Health Immune Support combines the wholesome power of echinacea, goldenseal, elderberry and vitamin C. Echinacea is an herb best known for stimulating the immune system. Often combined with echinacea, goldenseal is a traditional favorite of American Indians to support the respiratory tract. Elderberry is a powerful antioxidant and delivers bioflavonoids to the body. Vitamin C is one of the most popular immune boosting natural products: it jumpstarts your natural defenses and protects against free radicals.