Astragalus: A traditional Chinese medicinal herb, Astragalus has been used to support T-lymphocyte function, macrophage phagocytic function, promotes antibody formation, and potentates lymphokine-activated killer cell (LAK) cell cytotoxicty activity. 

Echinacea: The most researched a published herb on the market today, Echinacea was traditionally used by the Native Americans as an immunostimulant more than any other medicinal plant. Echinacea supports the immune system by way of phagocytosis and white blood cell activity including NK-cell and interferon activity.

Vitamin C: The most commonly used nutrient for immune support is vitamin C. Vitamin C, an antioxidant, is essential to the human body for growth and health. It is utilized in the body to help to produce lymphocytes or white blood cells needed to fight infection, promote phagocytosis which involves cells that will "eat" bacteria, viruses and other harmful invaders, and is required by the thymus gland, one of the major glands involved in immunity.