Fine. Do it like the experimental physicists do: if you think you're on to something, refine and repeat the experiment in order to get a more robust, repeatable result.
The original sin of the medical and social sciences is failing to recognize a distinction between exploratory research and confirmatory research and behave accordingly.
The problem is that it’s really hard to get good data, ethically, in medical sciences. Something that improves outcomes by 5-10% can be really important, but trying to get a study big enough to prove it can be super expensive already.
> Nobody likes being in the control group of the first working anti-aging serum...
You only know whether it works when the study has been completed. You also only know whether the drug has (potentially) disastrous consequences when the study has been completed. Thus, I am not completely sure whether your claim holds.