can you overdose on b12 injection Symptoms of Overdose: Causes and When to Seek Help – Bolt Pharmacy Benefits of Vitamin B12 Shots

A burning or sharp pain during injection (this may indicate you've hit a blood vessel or muscle) Medication leaking out of the injection site Injection site reactions like bruising, swelling or redness that worsen after the injection Shortness of breath call 911 if this occurs The medication isn't having its intended effects, such as reduced appetite

Oral supplements can help you maintain proper levels of nutrients

28 However, oral therapy does not improve serum methylmalonic acid levels as well as intramuscular therapy, although the clinical relevance is unclear

Rhode BM, Tamin H, Gilfix BM, Sampalis JS, Nohr C, MacLean LD

If you have high B12 levels, don't panic, and rely on your primary care clinician to help understand what's happening