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While vitamin B12 injections are generally safe, some people may experience mild or temporary side effects: Redness, swelling, or mild pain at the injection site Dizziness or lightheadedness shortly after the B12 energy shot Nausea or upset stomach in rare cases Mild fatigue or feeling tired right after the vitamin injection Headache or brain fog (usually temporary) Mild fever Allergic reactions (rare) rash, itching, or shortness of breath Low potassium levels (very rare, but can happen with frequent vitamin shots in deficient individuals) Ready to Feel Like Yourself Again
Some patients experience an immediate sense of alertness, while others notice gradual improvements over several days
Molecules (Basel, Switzerland) , 19 (11), 19066-77
[Zugriff 14.5.20] Fraziano M et al
Other receptors for SARS-CoV-2, such as CD147, have also been reported 56
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