Cosmetic formulation, especially for use on aging and/or stressed skin, which contains water and substance(s) forming lamellar structures with water, also contains compound(s) (I) with trimethylammonium-methyl group(s) (IA), metabolites of (I) and/or S-adenosylmethionine. Cosmetic formulation, especially for use on aging and/or stressed skin, which contains water and substance(s) forming lamellar structures with water, also contains compound(s) (I) with trimethylammonium-methyl group(s) of formula (IA), metabolites of (I) and/or S-adenosylmethionine:
