It is alkaline when the pH value is between 7.35 and 7.45, and acidic when the pH value is lower than 7.35.
About the acidity and alkalinity of human body and skin;
There are alkaline and acidic parts in the human body, and most organs and tissues are alkaline, such as blood, bones, muscles and internal organs. There are also few acidic parts in the human body, such as stomach and skin. Therefore, human skin is an acidic part, and health is closely related to the degree of maintaining proper acid and alkali in the body. The pH value of human skin will change with the influence of diet, environmental pressure and other factors. Once out of balance, there will be various skin problems. Therefore, in order to keep skin healthy, we should pay attention to maintaining a good attitude in daily life, know how to decompress our lives and cultivate healthy eating habits, eat more fresh fruits and vegetables, balance the intake of various nutrients without partial eclipse, and do more aerobic exercise, such as jogging or fitness.
To sum up, people's skin is divided into alkaline and acidic, and you can know the acidity and alkalinity of your skin by detecting saliva with PH test paper. When the body's pH is out of balance, various skin problems will occur. Therefore, through healthy eating habits, healthy aerobic exercise and maintaining a good attitude, the pH in the body can be balanced, which is more conducive to the health of the skin.
Reference link Baidu Encyclopedia Human acid-base balance