do vitamin b12 injection go bad Are Shots Right for You? Do B12 Shots Expire or

Around 50% to 98% of vitamin B12 is excreted from the body 48 hours after injection

When Injections Are Medically Indicated People with certain issues might need 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

These injections are given into the muscle, allowing your body to more fully absorb the nutrients than it would be able to take these supplements orally with pills or powder