What it is
Menadione is a small naphthoquinone molecule chemically related to the vitamin K family, included in cosmetic formulas as a skin-conditioning agent at low levels. In sunscreens it generally appears as a minor component within antioxidant or conditioning blends rather than as a primary active. Its use level and solubility are determined by the overall formulation.
Safety & warnings
Menadione can be irritating or sensitizing to skin for some individuals, so it is used at low levels in cosmetic formulas. It is not a recognized fragrance allergen. People with known sensitivity to quinone-type compounds should be aware of its presence.
Origin & sourcing
Menadione is a synthetic compound manufactured through organic synthesis; it is not typically obtained by extraction from natural sources.
Questions everyone asks
What is menadione used for in skincare?
It is used as a skin-conditioning ingredient at low levels, generally within antioxidant or conditioning blends.
Is menadione the same as vitamin K?
It is a synthetic compound related to the vitamin K family, sometimes referred to as vitamin K3, but it is a distinct molecule.