The Placebo effect has always been a thing ever since it was discovered by Henry K. Beecher in 1955. What isn't generally known about it, is that the Placebo effect appears to have become stronger over the years. Of course this proof is a statistical thing based on a relevant sample of humanity, but in my personal life, I have seen it grow over the years.
As a result, I came through the Corona period without ever having had the disease, and my susceptibility to any illness has sufficiently improved over the years. I attribute this to the development of humanity from a biological (chemical based) reality into a more energetic (idea based) reality. Oddly enough, this growing placebo effect is actually thwarting development of further pharmaceutical solutions, because it is becoming harder to determine the true effect of the drugs on test.