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
1 2 "Pernicious anemia: new insights from a gastroenterological point of view"
Document daily dose and site rotation to maintain consistency
very happy with my b 12 shots
[63] There are not enough studies on whether pills are as effective in improving or eliminating symptoms as intramuscular injections