In order to assess the quality of different brands of hydrogenated oils, the nickel and vitamin A contents, and the chemical constants of these oils were determined and compared with those of refined corn oil and butter fat. It was observed that the nickel and vitamin A contents of ten important brands of banaspati ghee manufactured in Pakistan varied from 18 to 105 ug and 3825 to 5482 IU per 100 g of the oil, respectively. Refined corn oil and butter fat contained nickel, and appreciable amount of vitamin A. The physical and chemical constants of the oils indicate that corn oil contained unsaturate fatty acids in higher proportions as compared to hydrogenated oil and butter fat. The higher saponification, Reichert-Meissl and Polenske values of butter fat show that it contained high amount of low molecular weight, volatile fatty acids. The use of refined vegetable oil is recommended to maintain human health.