Antioxidants also limit the damage of cells and so provide support to the immune system when the disease occurs. Vitamins are a group of organic substances that are essential in small quantities to normal metabolism. Vitamin C and are specific antioxidants that are typically used as supplements to counter the oxidizing chemicals that originate during the damage to cells. Vitamin C also plays a key role in the increase in the production of the T-cell to a growing resistance to bacterial and viral infection and allergies. Vitamin E, on the one hand prevents oxidation of vitamin A, red blood cells and unsaturated fatty acids. Carotene, an unsaturated hydrocarbon found in many plants, Orange compound is converted to vitamin A in the liver. It is essential for a skin, a growth, digestion and a repair healthy body and tissues of the mucous membranes of protection from the mouth, nose, throat and lungs to reduce the vulnerability to infections.