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The reduced form, also known as the active form, is known for scavenging free radicals

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Possible B12 injection side effects tend to be mild and short-lived, and may include: Injection site pain, redness, or swelling Mild itching Brief diarrhea (less common) A feeling of warmth after the injection Serious side effects are rare

Reported reactions are almost entirely local, the site redness and bruising covered above, with mild nausea or fatigue turning up rarely and passing on its own

The most common cause is pernicious anemia, an auto-immune disorder that affects around one in every 10,000 people