Stearic Acid
The AI Verdict
Stearic acid is a fatty acid found naturally in the skin barrier and used widely as an emulsifier and thickener in moisturizers. While it gives creams a rich, luxurious texture, it has a comedogenic rating of 3 out of 5. For acne-prone individuals, high concentrations of stearic acid can cause congestion and closed comedones, though it is less severe than its derivatives like Isopropyl Myristate.
Chemical Profile & Risk Factors
A saturated fatty acid with a comedogenic rating of 3. Can cause congestion and closed comedones when used in high concentrations on acne-prone skin.
A self-emulsifying form of stearic acid. Not only can it clog pores (rating 3), but it is a known trigger for Malassezia folliculitis (fungal acne).
Often used in shaving creams and soaps alongside stearic acid. Highly alkaline and can disrupt the acid mantle, leading to barrier damage and breakouts.