Placebos actually work in medical studies, people who take them often get better, as the patient thinks that they are receiving a medicine that will make them better, when in fact, they aren’t getting medicine.
It is all due to beliefs.
What we think is possible, is possible. If you have a strong enough faith, anything is possible.
We can use our minds for amazing things, when conscious and in control, pity we occupy it with useless repetitive thought on a daily basis.