Wheat germ oil is extracted from the germ of the wheatkernel, which makes up 2-3% by weight of whole grain wheat.[1] Wheat germ may yield 8-14% of oil in its total content.[1]
In a reference amount of 100 grams (3.5 oz), wheat germ oil supplies 884 calories.[2] Wheat germ oil has a high content of vitamin E (149 mg/100g),[2] the content of which diminishes substantially due to oxidation by extrusion treatment, oven-roasting or storage for 6 weeks.[1] As a cooking oil, it is strongly flavored and easily perishable.[citation needed]