This formula has been used at the onset of a cold to relieve swollen lymph nodes, a sore throat, body aches plus fever and chills. It can also be taken as daily maintenance for your immune system’s overall health. The herbs in Immune Boost are known to stimulate and support the immune system, causing a slight warming in the body. Astragalus and Reishi are used as immune-system enhancers. They have been shown to increase the strength of T-cells, the white blood cells of the body that attack the invaders that cause disease. Elderberry fights and destroys a virus’ ability to reproduce itself. Schizandra builds the body’s immune system and supports the body against damage due to stress.