Echinacea in the field – What teas can you use to support your immune system from the inside out? Immune system booster all-stars of the herbal world include dozens of different plants from the ubiquitous elderberry and echinacea to the less well-known Andrographis, Tulsi basil, and Reishi mushroom. Reishi is revered worldwide for its ability to support the physical and spiritual heart while heightening the immune system. In fact, any of the medicinal mushrooms such as reishi, turkey tail, chaga, maitake, or shitake, have a centuries-old reputation for promoting longevity and immunity by helping the body adapt to various stressors.