● Deficiency of vitamin B2 (Riboflavin) causes cheilosis, digestive disorders and burning sensation of the skin. ● Deficiency of vitamin B12 causes Pernicious anaemia which is RBC deficiency in haemoglobin. ● Deficiency of vitamin B6 (Pyridoxine) causes Convulsions. ● Deficiency of vitamin B1 (Thiamine) causes Beri-Beri (loss of appetite and retarded growth).