JUST ONE DROP tells the little known story of homeopathy: the most controversial system of medicine. To many, homeopathy seems implausible. They fear it is purely a placebo effect or worse, a form of deception or quackery. Yet, homeopathy has been around for over 200 years and is used by millions of people around the world. The film explores the controversy, reveals the rich history, dispels myths and misconceptions, and asks whether or not homeopathy has been given a fair shake.