Aminomethyl Propanediol

Aminomethyl propanediol is a synthetic organic compound commonly used in cosmetic formulations as a buffering agent. Its primary role is to maintain or adjust the pH of a product, helping to keep skincare formulations stable and within an optimal pH range during storage and use.

This ingredient works behind the scenes rather than delivering active skincare benefits itself. It is typically used in small concentrations and appears in roughly 0.2% of skincare products on the market.

Aminomethyl propanediol functions as a buffer—a substance that resists changes in pH. When added to a formulation, it accepts or donates hydrogen ions as needed, keeping the product's pH relatively constant even as ingredients interact or as the product ages.

This stability is important because many active skincare ingredients (such as vitamin C, niacinamide, or hydroxy acids) work most effectively within specific pH ranges. A buffer helps preserve these conditions throughout the product's shelf life.

There is no need to apply this ingredient consciously or in any particular way. It is included in formulations by the manufacturer to support product stability. Simply use skincare products containing it as directed on the packaging. Its presence does not change how you should use the product.