SODIUM HYDROXIDE

Sodium hydroxide, also known as caustic soda, is an alkaline salt and is used in cosmetics in very small amounts as a pH regulator to ensure that the final product reaches the desired pH range to ensure skin compatibility and product stability.1 In higher doses, sodium hydroxide is harmful. (1)

(1) Burnett, C. L., Bergfeld, W. F., Belsito, D., Hill, R. A., Klaassen, C. D., Liebler, D., Marks, J. G., Shank, R. C., Slaga, T. J., Snyder, P. W., Gill, L. J. & Heldreth, B. (2021). Safety assessment of inorganic hydroxides as used in cosmetics. International Journal of Toxicology, 40(2_suppl), 16S-35S. https://doi.org/10.1177/10915818211018381