Sodium hydroxide, also known as caustic soda, is an alkaline salt and is used in small amounts in cosmetics as a pH regulator. This ensures that the final product achieves the desired pH range, thereby ensuring skin compatibility and product stability.(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), 16–35.
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