Aminomethyl propanol is a synthetic ingredient used in cosmetics as a pH adjuster. It is considered safe as currently used in amounts of 2% or less in cosmetic formulas.
Aminomethyl propanol can penetrate skin’s uppermost layers, but does not go further, meaning it does not get into the body. It is believed to aid the penetration of other skin care ingredients which in some circumstances (such as exfoliating acids) can make them more effective.
References for this information:
International Journal of Toxicology, Supplement, November-December 2009, pages 141S-161S
Food and Chemical Toxicology, February 2008, pages 678-687
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