You may wish to discuss testing with a healthcare professional if you: Experience ongoing unexplained fatigue Follow a vegan or vegetarian diet Have a history of gastrointestinal surgery or digestive conditions Have previously been diagnosed with low B12 Have symptoms such as numbness, tingling, or cognitive changes Testing helps determine whether B12 injections are appropriate or whether another cause should be investigated
supports For the latest stories on the science of healthy living, subscribe to NPR's Health newsletter
WHAT HAPPENS DURING A VITAMIN B12 INJECTION APPOINTMENT
B12 is delivered through an IV infusion by inserting a small catheter into a vein, allowing a saline-based solution containing vitamin B12 to flow directly into the bloodstream
See every Vitamin B12 reference on this page Freshness: we automatically re-check this combination every week this pair was last checked July 26, 2026
The field moves rapidly toward more effective, better-tolerated, and more personalized metabolic therapies
