Carlson Labs Key E Suppositories with Natural Vitamin E are natural soothing inserts prepared with a base derived from coconut and palm oils. Each suppository supplies 30 IU of Natural-Source Vitamin E. Studies support the bodyÕs preference for Natural Vitamin E, and Carlson All-Natural Vitamin E is derived from soybean oil, a natural food source. Research shows natural Vitamin E to have twice the biological activity of synthetic Vitamin E, and is retained within the body longer. Carlson Natural-source Vitamin E can be used with confidence. On each Carlson Vitamin E label you will find the words: ÒIndependently Assayed to Guarantee. 100% Potency. 100% Natural-Source Vitamin EÓ.