Fermented vinegar has long been consumed in Japan as a health food. The mash is advertised as coming from Okinawa, but the company is in Hiroshima. It is black because it is fermented with black garlic. It is able to carry a health claim due to the vitamin B2 and B6 content. It is a bit pricey at 4,200 yen for 1.8 liters, but it is meant to be diluted with 5 to 7 parts cold water before drinking.