The normal tension of day-to-day life, along with deficiencies of essential daily nutrients, put our bodies under a tremendous amount of stress. That’s why it is so essential to take nutritional supplements for daily nutrition. These
include vitamin C, important for ensuring immunity and overall health, vitamin K, vital for bone health, vitamin E, which increases immune and cardiovascular function, as well as overall bodily health, and the various nutrients under the vitamin B complex.
Within the vitamin family, one can find a supplement for any health concern, including the eyes, heart, brain or immune system, as well as formulations for specific conditions, including allergies, bones/joints, skin, energy and vitality, and cardiovascular and digestive health. There are even nutrients for effective and stable weight management, and healthy sexual stamina, as well as formulas for overall men and women’s health.
Different Vitamins play different role in our body. 
Some vitamins act in groups with each other whereas others act alone. Functions of different vitamins are given below:
1. Vitamin A helps in regeneration of visual purple, prevents night blindness and helps to maintain good eyesight. It also prevents the condition known as urolithiasis where urinary calculi in the form of calcium phosphate are present. It is also essential for growth.
2. Vitamin D is essential for bone development and also prevents rickets. Vitamin D maintains normal structure of bone and helps to maintain the equilibrium between bone calcium and blood calcium. It also helps in the normal development of teeth.
3. Vitamin E prevents sterility and muscular dystrophy.
4. Vitamin K is essential for the formation of prothrombin of blood, hence essential for blood clotting and prevents haemorrhage or excessive loss of blood from the body during injury or accidents. The haemorrhagic disease in the newborn is believed to be due to lack of vitamin K, since vitamin K deficiency in the newborn is due to absence of bacteria in their gut.
5. Vitamin B1 prevents the disease known as Beri beri. It has a potential role in the oxidation of sugar in tissues, including brain. In its absence, pyruvic and lactic acid fails to be metabolized with a result of accumulation of these substances in blood and tissues. It also helps the enzyme system, which is responsible for the synthesis of fats from carbohydrates and proteins.
6. Vitamin B2 is concerned with oxidative processes in the cells. It acts as a coenzyme for flavoprotein enzymes in the body. Deficiency produces loss of appetite and weight. Therefore it is essential for growth.
7. Nicotinic acid prevents the disease known as pellagra. It helps in the formation of fats and carbohydrates. It is also essential for growth.
8. Vitamin B6 prevents skin diseases, especially itching and redness of the skin. It is also related to the metabolism of unsaturated fatty acids and also helps in the synthesis of fats from carbohydrates. This vitamin with the help of thiamine increases the formation of fats from proteins. 
9. Folic acid prevents macrocytic anemia in human being. It takes part in the formation and maturation of the red cells. It is also required to maintain the normal pregnancy.
10. Vitamin B12 prevents pernicious anaemia. Essential for the formation and maturation of red blood cells. It also increases the white cell count and the platelets through its action in the bone marrow. It is also concerned with the normal health and activity of certain parts of the nervous system. This vitamin is also essential in the biochemical conversion of carbohydrate to fat or fat to carbohydrate.
11. Vitamin H deficiency in man causes peculiar dermatitis. Absence of this vitamin produces lassitude and sometimes gastro-intestinal symptoms.
12. Para-amino-benzoic amino acid (PABA) prevents premature graying of hair in rats. Its role in human nutrition is not definitely established.
13. Vitamin B4 and B5 are essential for the growth of pigeons. Their value in human dietary is not yet proved. 
14. Vitamin C prevents human scurvy. It is also involved in many other important physiological functions. It is essential for the proper functioning of the formative cells of various tissues, such as fibroblasts, osteoblast etc. it plays an important role in wound repair. The synthesis of insulin in the beta cells of islets of Langerhans is impaired during vitamin C deficiency, resulting in hyperglycemia and disturbance in carbohydrate metabolism.
15. Vitamin P acts as a permeability factor. It is closely related to vitamin C and helps its action.
16. Vitamin B3 takes part in carbohydrate metabolism. The condition of alopecia (falling of hair) and certain gastro-
intestinal disorders are produced by the deficiency of this vitamin. Vitamin B3 in the form of CoA takes part in the reaction of both the synthesis and metabolism of fatty acids and cholesterol.
A variety of potent and essential antioxidants, that defend the body against the dangers of free radicals, should be included in any vitamin or multivitamin. Among the most popular antioxidants are: coenzyme Q 10, which is vital for heart and liver health, as well as for the production of cellular energy; selenium for immune functioning and possibly a reduction in certain degenerative diseases, such as cancer; and lutein, which has been shown to offer unbelievable visual benefits.
