Placebos are the most widely used treatments in the history of medicine. Thousands of studies show that they can be effective and make us happier and healthier. Yet confusion about what placebos are and how to measure their effects prevents some doctors from using them to help patients. Meanwhile, damage caused by the nocebo effect—the negative effect of expecting something bad—is not widely recognized.

In The Power of Placebos, Jeremy Howick provides an interdisciplinary perspective on placebos and nocebos based on more than twenty years of research and data from over 300,000 patients. This book, the culmination of that research, offers practical ways for researchers, policymakers, and doctors to put placebo and nocebo research into practice to improve health outcomes.