pH is a measure of acidity or alkalinity, with 0 the most acidic, 7 neutral, and 14 the most alkaline
Lai K, Chen Z, Lin S, Ye K, Yuan Y, Li G, et al
Li L-b, Yang L-x, Liu L et al

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Compreh Physiol
However, the accumulation of excessive reactive species can have broad damaging effects and must be counteracted by the body's antioxidant systems