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The biometrological measurements of skin hydration and transepidermal water loss are important parameters to evaluate the moisturizing ability of creams and lotions suitable for this purpose. This study analyzed, through biometrological tests, the performance of five different commercial moisturizing creams containing 10.0 % urea. The amount of water in the stratum corneum was analyzed by Corneometer®, equipment that measures the skin hydration by capacitance principle. The transepidermal water loss was analyzed by TEWLmeter®, equipment that measures water evaporation through the skin. Student t-tests were applied to these measures, which demonstrated significant differences between the hydration performances of the moisturizing creams analyzed. The moisturizer identified as "D" showed a better moisturizing ability and better prevented transepidermal water loss. Overall, results showed the importance of testing equivalence for topical products, since, as demonstrated in this study, although certain products may contain the same active substance, differences in their vehicles’ composition can alter the effectiveness.

Biometrological methods to evaluate in vivo the skin hydratation of different commercial moisturizers containing 10.0% urea as the main claim