Zenso is a company that provides you with the essentials to healthy weight management from Japan. One of the key ingredients that Zenso uses is Black vinegar. With over 200 years of brewing history, Kagoshi in Kyusu, Japan, is reckoned as a perfect place for the fermentation of black vinegar (Which is known as Kurozu in Japanese). One of the rarest and oldest vinegar brewing methods in the world for the fermentation of Kurozu takes place in outdoor ceramic jars as it undergoes three stages of fermentation naturally. Such traditional methods are still being practiced by vinegar brewers up to this very day & age. They will check the jars daily to monitor the fermentation state through sound, smell, color & taste for up to 3 years.