| K R Brain The role of menthol in skin penetration from topical formulations of ibuprofen 5% in vivoK R Brain An eX Analytical Services Ltd, Cardiff University, UK Skin Pharmacol Physiol 19:17-21. 2006 Percutaneous penetration of diethanolamine through human skin in vitro: application from cosmetic vehiclesK R Brain An-eX Analytical Services Ltd, Redwood Building, Cardiff CF10 3XF, UK Food Chem Toxicol 43:681-90. 2005 In-vitro human skin penetration of the fragrance material geranyl nitrileK R Brain An eX, Redwood Building, Cardiff, CF10 3XF, UK Toxicol In Vitro 21:133-8. 2007
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