(±)-α-Tocopherol nicotinate (Vitamin E) (in animal feedings, 50 mg/kg or 585 mg/kg, 7 weeks) significantly increases the proportion of CD4+CD8- T cells and the expression of ICAM-1 in thymic epithelial cells (TECs) isolated of male Fisher rats at high dose concentrations of 585 mg/kg compared to low dose treatment of 50 mg/kg.