how long for b12 injections to start working Fast Does a Vitamin Shot Work? B12 Shots & B12 Injections:

Rare side effects of B12 shots (require medical attention) Serious reactions to B-12 shots are uncommon, but its important to be aware of them: Allergic reaction, including rash, hives, dizziness, or trouble breathing Significant swelling, pain, or warmth that worsens at the injection site Palpitations or chest discomfort Signs of drug interactions, especially if you take multiple prescription medications If you experience symptoms that feel intense, progressive, or unusual, you should contact your provider right away

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Research shows that 4 mm needles are effective, less painful, and carry no risk of penetrating muscle tissue, even in lean people