If you have a known deficiency or medical concern, follow your providers guidance
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
European Food Safety Authority
In the ongoing study of healthy aging, scientists continue to explore novel compounds that may influence metabolism, cellular function, and age-related changes
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[DOI] [PMC free article] [PubMed] [Google Scholar] 2.Center for Disease Control and Prevention