Data supporting the participation of resistin in oxidative processes have been sporadically published. A significant interaction among a single nucleotide polymorphism in the promoter of the human resistin gene and a marker of oxidative stress (NAD(P)H:quinone oxidoreductase I) has been found7. Retinoic acid, the acid form of vitamin A, inhibited the expression of resistin in mice and reduced the higher resistin levels of ten males affected by psoriasis8. Resistin serum levels were inversely associated with nitrotyrosine (NT), a product of free radical activity9.