The newest trials were in healthy human volunteers and indicated that the drug can cause significant reductions in the levels of a known biomarker of bone resorption. The study showed that these positive effects were noted only 15 minutes after the drug was taken
Clinical Trials: Why Volunteer? / Clinical Trials For Medical Treatments
Remember, the vast majority of drug trials are successful – its only a very small minority that go wrong which feature press coverage. And you reserve the right to leave a trial at any time.