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Name the vitamins which make the B complex

Name the vitamins which make-up the B complex? Which troubles does the lack of such vitamins cause?

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Vitamins of the B complex are: vitamin B1 or thiamin; riboflavin or vitamin B2, and niacin (B3), necessary for the formation of the hydrogen acceptors NAD, FAD and NADP of the energetic metabolism; pyridoxine or B6; and cyanocobalamin or vitamin B12.

Lack of vitamin B1 causes beriberi, failure of fatigue and appetite. The deficiency of vitamin B2 causes mucosal injuries in the tongue, mouth, and lips. Lack of niacin causes nervousness, digestive disturbances, loss of pellagra and energy. Lack of vitamin B6 causes skin lesions, convulsions and irritation.

Vitamin B12 acts altogether with folic acid and its scarcity causes cell division disruptions leading to the pernicious anemia (a kind of megaloblastic and nutrient scarcity anemia).The absorption of vitamin B12 based on another substance termed as the intrinsic factor secreted by the gastric mucosa.

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