In the normal state of human body, the PH value of the body should be maintained between 7.3 and 7.4, which is slightly alkaline. Different parts of the body are different. The body fluid PH is 7.4, the stomach PH is about 2, and the intestinal PH is alkaline. Different parts of the body maintain their own PH values to perform different functions.
The surface pH of normal skin is about 5.0 ~ 7.0. The average pH of the skin is about 5.8.