{Reference Type}: Journal Article {Title}: Safety Assessment of Methylxanthines as Used in Cosmetics. {Author}: Cherian PA;Bergfeld WF;Belsito DV;Hill RA;Klaassen CD;Liebler DC;Marks JG;Shank RC;Slaga TJ;Snyder PW;Fiume M;Heldreth B; {Journal}: Int J Toxicol {Volume}: 0 {Issue}: 0 {Year}: 2024 Jul 24 {Factor}: 2.38 {DOI}: 10.1177/10915818241260282 {Abstract}: The Expert Panel for Cosmetic Ingredient Safety (Panel) assessed the safety of three methylxanthines, Caffeine, Theobromine, and Theophylline, as used in cosmetics. All of these ingredients are reported to function as skin-conditioning agents in cosmetic products. The Panel reviewed the data relevant to the safety of these ingredients and concluded that Caffeine, Theobromine, and Theophylline are safe in cosmetics in the present practices of use and concentration described in this safety assessment.