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Symptoms may include: strange sensations, numbness, or tingling in the hands, legs, or feet difficulty walking (staggering, balance problems) anemia a swollen, inflamed tongue yellowed skin (jaundice) difficulty thinking and reasoning (cognitive difficulties), or memory loss paranoia or hallucinations weakness fatigue While an experienced physician may be able to detect a vitamin B12 deficiency with a good interview and physical exam, a blood test is needed to confirm the condition
Other causes include strict vegan diets, malabsorption disorders (coeliac disease, Crohn's disease), gastrointestinal surgery, and long-term use of medications such as metformin or proton pump inhibitors
However, some rare side effects of too much vitamin B12 can include: Headache Weakness Nausea Diarrhea Tingling sensations in the hands and feet Allergic reactions or skin rash (uncommon) When To Seek Medical Advice Risk of vitamin B12 deficiency: Groups at a higher risk of vitamin B12 deficiency include older adults, people who only eat plant-based foods (vegans and vegetarians), and those with certain chronic conditions (gastrointestinal disorders that can affect vitamin absorption)
Both bacteriostatic water and sterile water are not used for straight injections, they have to be diluted with a drug or solvent