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Symptoms of B12 Overload Though rare, extreme excess may cause: Itchy, inflamed scalp Acne or folliculitis Anxiety/insomnia (indirectly worsening hair loss) Gastrointestinal distress Managing High B12-Related Hair Loss 1

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Provides energy to those who are deficient

Symptoms of ulcers might be very vague, just going off feed or general gut discomfort

Wellness 20 May 2026 5 min read Do B12 injections need to be refrigerated

doi: 10.1038/nrc1014 2 ParkJREggertACaronH