The most frequent symptoms are: Developmental delays Anaemia Loss of appetite Chronic vomiting Weight loss Low brain volume Spasms/cramps Apathy Irritability In the most severe instance, vitamin B12 deficiency can lead to respiratory failures and coma (51)
You can simply base your length of treatment on these values until you get to the optimal range if youd like
PMC10706451 Brown B, Cohen L, Jackson R, et al
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As the However, while risks of severe toxicity are low, some side effects are still possible, such as: temporary symptoms, such as itching, swelling, or diarrhea allergic reaction damage from the injection hypokalemia, or low potassium levels infection negative interactions with certain medications, such as: metformin (Fortamet, Glucophage, Riomet) medications to reduce gastric acid, such as proton pump inhibitors or H2 receptor antagonists Always talk with a doctor before using vitamin B12 supplements