lump at injection site after b12 shot Reactions: Symptoms, Treatment, and Prevention Common Mistakes in B12 Injections

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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

Genuine symptoms directly attributable to B12 overdose are poorly documented and exceptionally rare

Stress is also known to burn through B12