A-Z — pH

pH

pH — the 'potential of hydrogen' or 'power of hydrogen'. The pH scale is a the numerical scale that measures acidity and alkalinity, ranging from 0 (most acidic) to 14  (most basic). A pH of 7.0 is considered neutral. The importance of a product’s pH is based on its correlation to the skin’s pH. Human skin has a pH in the acidic range, varying from 4.4 to 5.6 depending on the individual and the area of skin tested. The value of the surface pH is due to acids present in the stratum corneum. External factors, such as perspiration, tend to...

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