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Nat Metab 3 , 14451465 (2021)
Symptoms of vitamin B12 deficiency include: Anemia Intestinal disorders and weight loss Fatigue, weakness, lightheadedness Memory loss or confusion Depression or dementia Rapid heartbeat and respiration Mouth or tongue soreness or bleeding Excessive bruising Injections are the most effective means of administration of vitamin B12 since they do not depend on the body's ability to absorb the substance through the gastrointestinal tract
Serious adverse reactions are extremely uncommon
Repeated injections can result in irritation, infection, or tissue damage at the administration site, particularly if sterile techniques are not strictly followed, Roberts says
doi: 10.1042/BSR20193160 292 LiGTanWFangYWuXZhouWZhangCet al
