Cytacon 50mcg Tablets Most people get enough vitamin B12 from their food, but if you have had stomach surgery, or certain diseases of the intestines, or a restricted diet, you may not absorb enough vitamin B12. Lack of vitamin B12 in the body causes a disease called pernicious anaemia (reduction in the number of red blood cells) which is often treated with vitamin B12 injections. Cytacon tablets are used to treat vitamin B12 deficiency when injections cannot be used.