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Here is a breakdown: Most people are able to get enough vitamin B12 from their diets, Allen says, so widespread supplementation isn't necessary

Known Side Effects Reported side effects are generally mild and infrequent: Injection site reactions: temporary redness, mild swelling, or tenderness Nausea: occasionally reported, usually mild and transient Dizziness: rare, typically with first doses Fatigue: some users report temporary tiredness Headache: infrequent, usually resolves quickly These effects typically diminish with continued use and rarely require treatment discontinuation

In type 2 diabetes, insulin may be required on a long-term basis if other treatment options are ineffective or when insulin deficiency occurs

When your B12 is low, you might feel: Tired all the time, even after sleeping well Mentally foggy, with trouble concentrating Dizzy or lightheaded Depressed or anxious Your energy drops, and basic tasks can start to feel overwhelming