Depends on who defines "if it worked" and frankly depends on lots of things. There are studies that counter studies. Please dont tell me youre grtting at a "the science is settled" argument. When is science or medicine ever settled?

Oh do you deny practices that start outside generally accepted medicine later become mainstream? Hand washing ( Dr Semmelweiss) chiropracric, putting maggots on wounds...

https://www.healthline.com/health-news/alternative-medicine-becoming-mainstream