Anaemia is marked by an abnormally low haemoglobin concentration. The most common cause is deficiency of iron which is an essential element of the haemoglobin molecule. Thus, the iron compounds in the diet will help to alleviate the symptoms of anaemia. Thiamine (vitamin B1 ), deficiency causes beri-beri. Riboflavin (vitamin B2 ) deficiency causes cheilosis and skin diseases. Cobalamine (vitamin B12 ) deficiency causes pernicious anemia. Folic acid (vitamin B9 ) causes anaemia.