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Deficiency : The deficiency of vitamin leads to skin changes and to night
blindness or failure of dark adaptation due to the effects of deficiency on retina.
Vitamin B1 (Thiamine) :
Sources: Yeast, egg yolk, liver, wheatgerm, nuts, red meat and cereals.
Deficiency: Fatigue, irritability, loss of appetite; severe deficiency can lead to
beri-beri.
Vitamin B2 (Riboflavin):
Sources: Dairy products, liver, vegetables, eggs, cereals, fruit, yeast.
Deficiency: Painful tongue and fissures to the corners of the mouth, chapped
lips.
Vitamin B3 (Nicotinic acid or Niacin) :
Sources: Lean meats, peanuts and other legumes, and whole-grain or enriched
bread and cereal products are among the best sources of niacin.
Deficiency: The deficiency state in humans causes skin disease, diarrhea,
dementia, and ultimately death.
Vitamin B5 (Pantothenic acid):
Sources: liver, kidney, eggs, poultry, and whole grains and dairy products while
apart from that it is present in perhaps all animal and plant tissues, as well as in
many microorganisms.
Deficiency: There is no known naturally occurring deficiency state.
Vitamin B6 (Pyridoxine):
Sources: liver and other organ meats, corn, whole-grain cereal, seeds and soy
products.
Deficiency: can result in central nervous system disturbances e.g. convulsions in
infants, More generally the effects of deficiency include inadequate growth or
weight loss and anemia due to the role of B6 in the manufacture of hemoglobin.
Vitamin B7 (Biotin):
Sources: fruits and meats, egg yolk, kidney, liver, tomatoes, and yeast.
Deficiency: No deficiency yet is known associated with this vitamin.
Vitamin B9 (Folic Acid):
Sources: green leafy vegetables, fruits like apples and oranges dried beans,
avocados, sunflower seeds, and wheat germ.
Deficiency: Its Deficiency during pregnancy is associated with birth defects,
such as neural tube defects
Vitamin B12 (Cyanocobalamin):
Sources: Liver, red meat, dairy products and fish.
Deficiency: megaloblastic anaemia.