Niacin or nicotinamide (nicotinic acid) is also called antipellagra vitamin. Its deficiency causes pellagra in which skin becomes scaly and pigmented. Deficiency of pyridoxine (Vit- B6 ) causes anaemia, neuritic pain, convulsions, skin lesions, etc. Deficiency o folic acid causes megaloblastic or macrocytic naemia while deficiency of biotic (vitaminB4 or itamin-H) causes dermatitis and anorexia.