Aminomethyl Propanol

Aminomethyl propanol is primarily a pH adjuster/neutralizer (commonly ~0.1–1%) used to raise pH in formulas; at typical leave-on levels it is usually tolerated but can sting on compromised or inflamed skin due to its alkalinity and local pH shift. Patch testing and clinical experience show low overall reactivity, yet it can trigger mild irritation (burning/erythema) in highly sensitive populations, especially when used alongside other actives or on barrier-impaired eczema skin. Given the need to avoid underestimating risk in reactive patients, this fits a mild irritancy profile rather than “gentle.” Safety Notes: Aminomethyl propanol (AMP) is primarily used as a pH adjuster/neutralizer (e.g., for carbomer/acrylates gels) and is commonly present at low levels around 0.05–0.3% in many leave-on lotions/serums and rinse-off cleansers where only minor pH correction is needed. Higher consumer-available levels are observed in strongly neutralized gel/cream systems (including some high-hold styling gels and certain acid-containing skincare gels) where more base is required, reaching about 1–2.5% in OTC products; above this is uncommon due to potential for elevated pH/irritation and formulation sensorial limits rather than a specific global cosmetic concentration cap.