Yes, it is suspicious, but I there is a lot of taboo around the idea of
promoting a drug as a nootropic, or anti-aging drug, even if it does work.
Most companies are very comfortable with the idea of producing drugs for
"the sick". That is why most of the currently available "nootrpics" were
developed to treat diseases of cognitive impairment, such as Alzheimer's
disease. If there are any side effects, those side effects are not so
acceptable when they occur in someone who doesn't *need* the drug.
Maybe the information you are looking for is contained in the data for the
control populations that are usually tested along with the "diseased"
populations in most sudies. In order to get this data you would have to
look at the original research articles, which shouldn't be too diffcult.