how to administer b12 injections Give Shot How To Self-Inject B12

This paradoxical response affects some patients receiving hydroxocobalamin treatment for vitamin B12 deficiency

Timing should be treated as an unproven research practice, not a medical schedule

PMID 17474166

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