With homeopathy, a small amount of herb is diluted with alcohol or water, to the point where the mixture is so dilute that there is not likely to be a single atom of the herb in a bottle of homeopathic medicine
Sixty years ago Martin Gardner discussed this in "Medical Cults", chapter 16 of Fads and Fallacies in the Name of Science:
Hahnemann [1755-1843, originator of homepathy] believed that as the drug became less "material" it gained "spiritual" curative powers, and in many cases recommended diluting until not a single molecule of the original substance remained! This produced remedies of extremely high potency. Moreover, the doctor believed, the full effect of such medicine may not be manifested until thirty days after being taken...
Wrangling among homeopaths over the exact nature of the "homeopathic dose" soon split the movement into two factions--the purists who followed Hahnemann, and the "low potency" men who thought it of value to preserve at least some of the original compound, even though only a few molecules. Modern purists have discarded Hahnemann's "spiritual" effects for mysterious "radiations" which remain after the material substance has vanished, and which have a physical basis not yet understood...
(OT but also of interest: chapter 15 is about "The Great Pyramid" and discusses the teachings of some guy named Russell.)