The immune system works in a fine-tuned and balanced environment. Various chronic diseases stem from under or over reactivity.

Herbs covered include amur bark, andrographis, balsam root, black eyed susan, cedar, chicory, Echinacea, fleeceflower, hemp, woad, lomatium, larch, sea buckthorn, self heal, spilanthes, yew, wild indigo, chaga and usnea.