Other factors that could lead to B12 deficiency are: Lack of adequate production of the intrinsic factor needed for B12 absorption B12 deficiency is common in elderly people as absorption of the vitamin reduces with age People who have had any intestinal surgery, such as that for weight loss Those with gut conditions such as Crohn's Disease, inflammatory bowel disease, or celiac disease SLIDESHOW See Slideshow Vitamin B12 injections Vitamin B12 supplements are given based on the condition that causes deficiency
Anemia (including pernicious anemia) therapy
Vitamin B12 is water-soluble, meaning your body eliminates excess through urine rather than storing it to potentially toxic levels
They are not interchangeable, and the comparison is not symmetrical
instead, it's a powerful agent for modulating the physiological drives behind eating
Generally, no harm comes from vitamin B12 injections, which are usually quite safe