Lemon juice is acidic with a pH level between 2 and 3. The high amount of citric acid in lemons is responsible for their acidic nature. Although lemon juice may have an alkalizing effect on urine, it has very little influence on the pH of blood. When discussing acidic versus alkalizing foods, it’s important to understand the concept of pH. The pH scale ranges from 0 to 14, with 7 being neutral, anything below 7 is acidic, and anything above 7 is basic or alkaline. Drinking lemon juice in its natural state can erode and damage tooth enamel due to its acidic nature. However, once metabolized, lemon juice has an alkalizing effect with many health benefits.