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Do Urea/Ammonium Lactate Combinations Achieve Better Skin Protection and Hydration than Either Component Alone?
Gloor M. · Fluhr J. · Lehmann L. · Gehring W. · Thieroff-Ekerdt R.
Skin Pharmacol Appl Skin Physiol 2002;15:35–43 (DOI: 10.1159/000049387)

Abstract

Twenty subjects with healthy skin were treated with the following formulations for two weeks: drug-free W/O vehicle, 5% ammonium lactate (CAS 52003-58-4) in W/O vehicle, 5% urea (CAS 57-13-6) in W/O vehicle, 3% ammonium lactate + 3% urea in W/O vehicle, 5% ammonium lactate + 5% urea in W/O vehicle. These formulations were applied in randomized order to 6 test areas on the forearms; one area was left untreated. Repetitive washings were additionally performed in the second treatment week. TEWL, stratum corneum water content (corneometry-determined electrical capacitance), and cutaneous blood flow (laser Doppler) were measured at baseline, day 7, and day 14. 5% urea and both ammonium lactate/urea combinations produced significant stratum corneum hydration and improved stratum corneum barrier function; there were no significant differences between these three treatments.

 

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