Synopsis
Non-invasive methods to evaluate skin hydration by measuring electrical properties are widely used in the
cosmetic industry. However, there is still some controversy about factors that affect measurement. For
example, concerns have often been expressed about the possible confounding effect of salts, either in the
formulation or on the skin. Ionized salts on the skin may increaselectrical conductivity and may lead to
changes in electrical properties that are not related to increased water content. We have performed a
systematic study of the effects of salt, i.e., sodium chloride, and glycerin on the electrical properties of skin
as measured by the three most commonly used instruments, the Nova © DPM 9003, the Corneometer © CM
825, and the Skicon © 200. Formulations containing salt from 0-3% and glycerin from 0-] 0% were tested
for their effects at one and two hours after a single application. Salt lowered the readings in the absence of
glycerin and increased the reading in the presence of glycerin. For all three instruments, there was a linear
correlation between the measurement and the glycerin level in the presence or absence of salt.
SynopsisNon-invasive methods to evaluate skin hydration by measuring electrical properties are widely used in thecosmetic industry. However, there is still some controversy about factors that affect measurement. Forexample, concerns have often been expressed about the possible confounding effect of salts, either in theformulation or on the skin. Ionized salts on the skin may increaselectrical conductivity and may lead tochanges in electrical properties that are not related to increased water content. We have performed asystematic study of the effects of salt, i.e., sodium chloride, and glycerin on the electrical properties of skinas measured by the three most commonly used instruments, the Nova © DPM 9003, the Corneometer © CM825, and the Skicon © 200. Formulations containing salt from 0-3% and glycerin from 0-] 0% were testedfor their effects at one and two hours after a single application. Salt lowered the readings in the absence ofglycerin and increased the reading in the presence of glycerin. For all three instruments, there was a linearcorrelation between the measurement and the glycerin level in the presence or absence of salt.
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