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For more details, take a look at our post on how fast a B12 shot works

This is especially important if: You follow a vegetarian or vegan diet You've had bariatric surgery You have digestive disorders that might affect absorption You're taking certain medications that interfere with B12 Monitoring Your B12 Levels If you're concerned about your B12 status, your healthcare provider can order simple blood tests to check: Serum B12 levels Methylmalonic acid (MMA) Homocysteine levels These tests provide a clearer picture of your actual B12 status than symptoms alone

Frequently Asked Questions How quickly do vitamin B-12 injections work

It also interacts with the dopamine and serotonin systems, though we dont fully understand those pathways yet