How important is maintaining the acidity in your body? Dr. Berg explains what PH Level means in your body and how to keep it at a healthy level. You may not know this but, there are various mechanisms in your body that work together to maintain a proper pH balance throughout your body. The acidity or alkalinity of a substance is measured using pH. The pH scale runs from 0 to 14, with 0 being the most acidic, 14 being the most alkaline, and 7 being neutral.