 Batabatacha has been found to contain Vitamin B12, but in insignificant amounts for human diets.Goishicha (碁石茶) from Ōtoyo, Kōchi and Ishizuchi-Kurocha grown at the foot of Mount Ishizuchi in Ehime prefecture are made by fermenting the tea in a two step process, first with aerobic fungi, then with anaerobic bacteria.