It is also known as Vitamin B3.Functions: Niacin is essential for the metabolism of carbohydrates, proteins and fats.Sources: It is present in kidney, liver, meat, poultry fish, legumes and groundnuts.Deficiency disorders: Deficiency of niacin in diet result a disease called Pellagra. NIACIN: Niacin is one of the ‘B’ Complex Vitamins. Photophobia, scaly skin and watering of eyes are some of the symptoms. RIBOFLAVIN - Riboflavin is otherwise known as Vitamin-B2.Functions: Riboflavin is essential for oxidation reduction reactions in the cell and in cellular respiration.Sources: It is present in milk, eggs, liver, kidney and green leafy vegetables.Deficiency disorders: Deficiency of riboflavin result in Glossitis Mouth cracks at corners. Sources: Cereals like wheat, oil seeds like groundnut, milk, meat, fish. In this disease, the calf muscles become tender, vomiting, tremors, convulsions, loss of appetite are seen. It is needed for the activity of some of the enzymes of carbohydrate metabolism.

Vitamin –B1 - Thiamine is also known as Vitamin B1. It contains – a) Thiamine – B1 e) Cyanocobalamin – B12 b) Riboflavin – B2 f) Folic acid c) Niacin - B3 g) Pantothenic acid d) Pyridoxine – B6 h) Biotin Water soluble vitamins Vitamin B Complex is group of Vitamins. Vitamin A, Vitamin D, Vitamin E and Vitamin K Water soluble Vitamins - Vitamin ‘B’ complex and Vitamin ‘C’ Fat soluble vitamins.

They are - Water soluble vitamins & Fat soluble vitamins.

Vitamins are classified into two types – based on their solubility. If antibiotics are indiscriminately taken, the bacteria present in the intestines which synthesize the Vitamins will be killed and it leads to Vitamin deficiency disorders Vitamins are micronutrients, which are very much essential for growth and for metabolism. Hopkins first identified Vitamins in MILK and named it as Accessory factors.Funk named the accessory factors as Vitamins (Vital amines).

Also cod liver oil cures a disease called rickets In 1912, Sir H.G. Sailors of this period knew that eating of liver cures a disease called night blindness andEating of lemons cures another disease called scurvy. VITAMINS - deficiency diseases History of vitamins :The story of vitamin dates back to 18th century.

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