122 citations
,
October 2010 in “Clinica Chimica Acta” In this study, washing rhesus monkey hair with water or shampoo significantly reduced cortisol levels, suggesting potential underestimation of chronic stress hormone deposition in hair due to washing.
93 citations
,
January 2007 in “Skin Pharmacology and Physiology” In this study, caffeine applied in a shampoo penetrated hair follicles faster and more effectively than through the skin surface within the first 20 minutes.
67 citations
,
April 2007 in “Journal der Deutschen Dermatologischen Gesellschaft” This article reviews the development and formulation of shampoos, emphasizing their dual role as cosmetic and medicinal products, but presents no new experimental findings.
51 citations
,
January 2014 in “International journal of trichology” This review examines the pH levels of various shampoos and reports no new clinical results, highlighting the potential importance of labeling pH values on shampoo packaging for hair and scalp health.
37 citations
,
October 2017 in “Saudi pharmaceutical journal” This study reports that six shampoo brands in Saudi Arabia generally comply with the national specifications, demonstrating good physicochemical properties such as foam stability and pH levels.