Placebo and nocebo are strong effects. Even when the people taking placebos knows it, they still work. https://www.nature.com/articles/s41598-021-83148-6 https

Placebo and nocebo are strong effects. Even when the people taking placebos knows it, they still work. https://www.nature.com/articles/s41598-021-83148-6 https://www.nature.com/articles/s41598-021-83148-6