The experiments on the production of yogurt. Have produced yogurt, two types of set yogurt and drinking yogurt was set yogurt with initial pH 6.60 when incubated for 24 hours pH dropped to 3.80, which is a pH lower than the pH of the yogurt. it typically has a pH of about 4.0 to 4.1, that is, yogurt, through trial deteriorate. And can not be consumed.