You should take B12 shots if you suffer from B12 deficiency, especially if you are not able to absorb B12 through the stomach (pernicious anemia)
[18] Systemic side effects may include headache, irritability, restlessness, depression, fatigue, or edema resulting from fluid retention
Vitamin B12, Fact Sheet for Health Professionals, National Institutes of Health, Office of Dietary Supplements Common questions about hydroxocobalamin, NHS (National Health Service), Hunt A, Harrington D, Robinson S
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Vitamin B12 is used when there are cases of Changes in vision and sense of sight