If you research a medical procedure (from different sources) and you often see something like:

I spent a long time in medical research and we do generally know why something works, but not always. Things are usually tested for five years on humans (after animal tests) before getting to market, and it can be an ethical dilemma to release something that appears safe but that you don't understand.

It's work right? That's enough for me, i'll take it

But the side effect is that u become a vegetable catepillar in a constant state of shock