"These acids keep the kombucha's pH level on the acidic end of the scale, anywhere from 2.5 to 6.0 (normal blood pH ranges from 7.35 to 7.45, while the stomach's pH is 0.9 to 2.0). As the product of a living organism, kombucha's composition is not standardized, but can vary with each batch. Reportedly, kombucha seems able to help balance the body's pH levels if they've become either too alkaline or too acidic. Lactic acid and the other acids apparently help rid the body of toxins that may be skewing pH."