Cosmetic ingredient

POTASSIUM HYDROXIDE

Potassium hydroxide is an inorganic base made of potassium and hydroxide. Outside the finished product, it may be supplied as a white solid in flakes, pellets, or granules, or as an aqueous solution, so it is not a botanical extract, oil, or butter.

Molecular structure of POTASSIUM HYDROXIDE
2D molecular structure
CAS number
1310-58-3
EC number
215-181-3
Molecular formula
HKO
Molecular weight
56.106
Chemical name
Potassium hydroxide
InChIKey
KWYUFKZDYYNOTN-UHFFFAOYSA-M

POTASSIUM HYDROXIDE: what it is

Potassium hydroxide is an inorganic base made of potassium and hydroxide. Outside the finished product, it may be supplied as a white solid in flakes, pellets, or granules, or as an aqueous solution, so it is not a botanical extract, oil, or butter.

On an ingredient list, it appears as POTASSIUM HYDROXIDE. It is an alkaline substance and is distinct from sodium hydroxide, although both are hydroxides that can raise the alkalinity of a preparation. Its name on a label does not disclose the amount used in that product.

POTASSIUM HYDROXIDE: what it does in cosmetics

In cosmetics, potassium hydroxide helps adjust how acidic or alkaline a preparation is. That pH adjustment is useful when a composition needs to reach its intended range; it does not, by itself, mean that the ingredient is there to moisturize, treat, or soften the skin.

For someone comparing labels, its presence usually points to an adjustment made to the preparation. What a cosmetic feels like in use depends on the other ingredients and on the final concentration, and a pH-adjusting role does not show that potassium hydroxide on its own treats acne, wrinkles, dark spots, or another skin condition.

POTASSIUM HYDROXIDE: conditions and care

Concentrated potassium hydroxide is corrosive to skin and eyes. In cosmetics, restricted applications must follow the conditions set for each use; a finished product should not be treated as equivalent to the concentrated material.

Use limits

Restrictions and conditions of use

Cosmetic restriction
III/15a, 15d
Catalogue presence

Products containing this ingredient

See which products include it and the name used in each composition.