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If the cause isn't dietary then it is an absorption problem so you need to find another way of replenishing B12 initially
Results can vary widely from person to person
Hormone Research, 53(6), 274278
Note any changes in morning energy, afternoon slumps, or exercise performance
Tell your prescribing doctor if you have any of these conditions, which can increase B12 shot side effects: An allergy to cobalt Kidney disease Severe megaloblastic anemia Side Effects from B12 Shots The most common B12 shot side effect is swelling at the injection site
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