VLDL-TG concentration and kinetics were evaluated by using stable isotope-labeled tracer techniques in four groups of postmenopausal women ( n = 27 total ) who were studied before and after treatment with either 17-estradiol ( 0.1 mg/d via continuous delivery skin patch ) , progesterone ( 100 mg/d via vaginal insert ) and T ( 12.5 mg/d via skin gel ) , or no intervention ( control group ) .