Coenzyme Q10 is a powerful antioxidant, naturally found in the cells, can have energising effects on the skin. Applied topically to the skin, it can neutralise free radicals. It is usually added to cosmetics because of its antioxidants properties.

See also:
Antioxidant
Ubiquinone

Ref:
Hoppe U, Bergemann J, Diembeck W, Ennen J, Gohla S, Harris I, Jacob J, Kielholz J, Mei W, Pollet D, Schachtschabel D, Sauermann G, Schreiner V, Stäb F, Steckel F. Coenzyme Q10, a cutaneous antioxidant and energizer. Biofactors. 1999;9(2-4):371-8. doi: 10.1002/biof.5520090238. PMID: 10416055.