Watch VoirFilms. Just One Drop takes a no-holds-barred look at the most controversial form of medicine ever invented. Homeopathy treats the entire person, not just the disease. It’s a specific form of medicine that uses minute doses of a highly diluted substance that stimulates the body to cure itself. It is these tiny doses that causes the most controversy. Researchers believe there is a release of energy in water that becomes mysteriously dynamic. Others think it’s purely psychological or worse, a form of deception or quackery. Yet millions claim homeopathy cures even though there is not yet a satisfying scientific explanation. It remains a mystery.