The issue focused on the research study. The researchers said that while medical studies are always done in a scientific way, research studies do not have to be perfect.

"We know it's important to study everything as scientifically as possible and if we can't test all of our hypotheses then we should still try," scientists from Ruhr-Universität Bochum said.

But some scientists say that using multiple experiments is only going to show what may or may not work.

