Solaray Guaranteed Potency Herbs deliver confidence by providing exacting and consistent dosing of thoroughly tested herbs of the highest quality available. Solaray guarantees the potency and Madagascar as the country of origin of its Centella asiatica (also known as gotu kola). In order to retain all of its synergistic constituents, this herb has not been extracted. Each batch is put through a rigorous selection process with only the very finest and most potent material being accepted.