When symptoms or risk factors suggest deficiency despite a reassuring serum B12 number, functional markers help clarify cellular B12 status
Certain vitamins when infused can alter effectiveness of calcium channel blockers, increase blood sugar, and effect INR for those on Coumadin or Warfarin treatment
Cancer 20 , 398411 (2020)
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Headache Mild diarrhea Mild pain or redness at the injection site Nausea Serious or rare side effects Stop taking Vitamin B12 Injection and seek immediate medical attention right away if you experience any of the following: Allergic reactions, including angioedema, hives, and trouble breathing Signs of heart problems, including swelling, rapid weight gain, and shortness of breath Signs of hypokalemia, including muscle weakness, slow or irregular heartbeat Contraindications: This is not an exhaustive list of contraindications