This deeply healing oil decreases the appearance and roughness of wrinkles. Penetrating and nourishing, it improves elasticity and alleviates damaged skin. What does IU mean on Jason products? IU stands for International Unit and is a measure that is used in pharmacy and for the use of measurement of vitamins. The precise definition of a UI differs from one substance to another but in the case of this product Vitamin E 1 IU is the biological equivalent of about 0.667mg. Jason Organic Vitamin E 45,000IU Maximum Strength Oil is part of the range of Jason Natural beauty oils, gels and butters. Choose from popular Jason Natural skin care products such as Jason Vitamin E Oil, Jason Aloe Vera Gel and virgin organic coconut oil to keep skin looking and feeling its best. Explore the full range of Jason Natural products, including natural face creams and the Jason C-Effects skin care range, available from Big Green Smile.