Tin oxide is a water-insoluble, inorganic metal compound that is used in cosmetic products primarily as an opacifier, viscosity regulator and filler. Due to its opacifying properties, it gives formulations a more opaque appearance. It is used in low concentrations in both wash-off and leave-on products(1-2).
(1) Bährle-Rapp, M. (2012). Springer Lexikon Kosmetik und Körperpflege. 4th revised and expanded edition. Springer.
(2) Bergfeld, W. F., & Liebler, D. C. (2014). Safety assessment of tin(IV) oxide as used in cosmetics. International Journal of Toxicology, 33(1_suppl), 40-46.
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