Untreated celiac disease and B12 deficiency tend to occur together, due to the malabsorption of nutrients, arising from the damage caused by gluten, to a celiac's intestines.
This vitamin is needed in order to have healthy red blood cells and a healthy nervous system. Other benefits of B12 include alleviating depression in the elderly, improving life for asthma sufferers, assisting us with our sleep (due to its role in melatonin production). reducing the ringing in the ears of people with tinnitus and increasing the sperm count in men whose counts are low.
When B12 is ingested, it is released into your body by the action of hydrochloric acid and enzymes. As it reaches your stomach lining it is bound with a secretion called Intrinsic Factor (IF) and then moved along to your small intestine. If the small intestine is working properly the B12-IF is passed through the walls into the bloodstream.
Once absorbed, the B12 is stored in the liver until needed, for up to three years. Any excess is secreted in the urine.