It’s believed that the Greek physician Hippocrates was among the first—or at least, the first reported—medical practitioners to use apple cider vinegar (ACV). Yes, way back in 400 B.C., he apparently used ACV mixed with honey as a treatment for various illnesses. Since then, fans of ACV have of course branched out to other parts of the world, and it’s become one of the most beloved natural products available today.