can a b12 injection make you tired I Feel All the Time. Do I Need Shot?: Shawn Veiseh, M.D.: Family Medicine Benefits of Vitamin B12 Shots

Vitamin B12 deficiency is Symptoms of B12 deficiency include: rapid breathing shortness of breath headaches palpitations or fast heart rate indigestion, diarrhea, or loss of appetite blurry vision weakness or tiredness mouth ulcers or irritation cognitive changes, such as difficulty with memory, judgment, or understanding infertility Contact your doctor to discuss injections or supplements if you experience any conditions or risk factors related to vitamin B12 deficiency

PMC 201508

Here are some common side effects- Common side effects Pain, redness, or swelling at the injection site Mild diarrhea or upset stomach Nausea or vomiting Dizziness Headaches Rare but serious side effects Allergic reaction, including itchiness, hives, difficulty in breathing, or swelling on the face, lips, and throat Irregular heartbeat It is essential to consult with a healthcare provider before starting vitamin B12 injections to ensure they are appropriate for your specific health needs and to receive proper administration guidance

Gentle swirling is always the recommended method