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Still, side effects from B12 supplements are possible, especially at higher doses, and include: Headache Nausea Vomiting Fatigue Weakness Diarrhea Tingling in the hands and feet Nasal spray Vitamin B12 is also available in a nasal spray

Slow IV push: used for lower doses, given over several minutes

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People Experiencing Unexplained Fatigue or Brain Fog Even without a formal diagnosis of deficiency, many people feel chronically tired, foggy, or unmotivatedsymptoms that can stem from suboptimal B12 levels

It regulates sleep cycles and has demonstrated benefits in improving sleep quality, which can positively influence daytime behavior

Nausea, vomiting, and upset stomach are other side effects linked to this hormone