Alistrol claims to be all natural, containing herb, fruit and seed extract.
Does that somehow make it better or safer? Peach pits are all natural too, and are touted as curing many things. Must be the cyanide in them.
Looking at the web site for Alistrol, it looks all nifty-sciencey. Even has a "clinical" section. But clicking on several of the references to research yields just more opinions and anecdotal reports. No true scientific study results.
I don't know if the stuff works or not. Neither does anybody else. And nobody is counting up the adverse effects. If you take it, you are engaging in your own private research study.
Like most of the "alternative" treatments.