Ingredient dictionary

Aminomethyl Propanol

Also listed as: AMP

Aminomethyl Propanol is a synthetic amino alcohol that mainly adjusts pH, meaning how acidic or alkaline a product feels and behaves. It is on the label of 38 products in our library. Checked against our library November 6, 2026.

The catch: none for most people; check the full product list if your skin reacts easily.

What Aminomethyl Propanol does

Adjusts and balances product pH
Neutralizes acidic thickening polymers
Helps gels and creams thicken

Aminomethyl Propanol is made in a chemical plant, not taken straight from nature. It belongs to the amino alcohols, molecules that carry both an amine part and an alcohol part. That structure lets it act as a weak base, soaking up extra acid to keep pH steady.

Formulators use it mainly to neutralize acidic polymers, the thickeners and film formers that often need a higher pH to swell and work. Once neutralized, these ingredients can build a smooth gel or a flexible film, which helps explain why it turns up in styling products and mascara. Its effect is quiet. It changes how other ingredients behave rather than adding much feel of its own.

Good for

Suits gels, styling products and mascara, where steady pH keeps the formula smooth and stable.

Be careful if

Nothing in particular for most skin types.

Frequently asked questions

Is Aminomethyl Propanol safe for skin?

Concentrations in cosmetics are kept low, and it is generally well tolerated. Anyone with very sensitive skin may still react, so a patch test on new products is a sensible step.

Does Aminomethyl Propanol make hair stiff?

It doesn't add stiffness on its own. Stiffness in styling products usually comes from film-forming polymers. AMP helps those polymers work well, so the hold and finish you feel reflects the whole formula, not this one ingredient.