Homeopathy claims that a substance causing symptoms in a healthy person can cure those same symptoms in a sick one, provided it is diluted almost to nothing. The film traces this idea back to Samuel Hahnemann's work in early 19th-century Germany, where he formulated the "Law of Similars" that still underpins the practice today. From there it turns skeptical, walking through the arithmetic of homeopathic dilution to show that many remedies are diluted so far past the point of containing a single molecule of the original substance that they are, chemically, just water or sugar. Clinical trials are examined and found wanting: the positive results tend to come from small or poorly controlled studies, while the effect that survives rigorous testing looks like placebo. The film also raises a regulatory point, that homeopathic products reach shelves without the trials required of conventional medicine, and asks what that means when people use them instead of treatment for serious illness. The tone throughout is plain and argumentative rather than neutral.