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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

*Available by prescription only, if medically appropriate

This means 100% bioavailability every milligram we give you reaches your liver ready to work

You would need to draw twice, introducing additional error and contamination risk with each needle puncture