Eight forms are found in nature. Vitamin E is a natural antioxidant that helps prevent cellular damage. The primary function of vitamin E is to maintain cell membrane integrity from oxidative damage. Good sources of vitamin E are vegetable oils, cereal products, liver and vitamin supplements. Vitamin K is known as the clotting vitamin, because without it blood would not coagulate.
Some studies indicate that it helps in maintaining strong bones in the elderly.
Vitamin K is used to describe several quinone compounds that helps the blood clotting process. The primary purpose of vitamin K is to activate several blood clotting factors to help blood clot and stop the bleeding process. A deficiency of vitamin K can result in defective blood clotting in children and adults. Bioflavionoids are a group of compounds found in citrus fruits. There is no evidence that these compounds are essential but additional research may help clarify if they are important for certain disease situations.