can b12 injections make you shaky Benefits of for Optimal Health What You Need to Know
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A serum B12 level test and ideally a methylmalonic acid test should be performed before starting B12 injections

(PubMed) Laird E, O'Halloran AM, Molloy AM, et al

animal liver and kidneys, clams, sardines, beef, tuna, salmon, milk, yogurt, and cheese
