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Common Side Effects Mild pain or redness at the injection site Temporary dizziness Serious Side Effects Allergic reaction (rare) Swelling or breathing difficulty Serious reactions are uncommon, but you should seek medical help if symptoms worsen
[2] Oral B12 supplementation generally takes longer to produce effects , with patients often noticing energy improvements within two to four weeks
On top of that, checking B12 blood levels once a year is a very poor indicator of true B12 status
B12-related fatigue can feel like being tired all the time, despite getting enough rest and sleep
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