1 2 "Nutrients: Vitamin B-12" (PDF)
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Unlike oral supplements that have to steer your entire digestive system (and might get lost along the way), these injections deliver vitamin B12 directly where your body needs it most
Talk to your doctor if you experience any allergic symptoms like: Hives Swelling of the face, lips and tongue Difficulty breathing Side effects on high dosing If you take very high doses of vitamin B12, above the RDA values, you might experience additional side effects like: Headaches Dizziness Nausea Vomiting It is crucial to stay within the recommended dosage range to avoid these issues
A B12 injections effect can last anywhere from a couple of weeks to a few months, and the difference comes down to why you are deficient, how well your body holds on to B12, and the dose and schedule you are on
Studies that used 1 mg/day in oral and intravenous trials did not show meaningfully better outcomes than lower doses, and higher doses were associated with more reports of headache, diarrhea, and gastrointestinal effects
