b12 injection vs supplement Vitamin Injections vs. Supplements: Which is Right for You? Vitamin B12 Tablets vs Injection

Side effects are rare and usually mild, such as slight discomfort at the injection site

The difference is in the research target

Potential side effects include: Injection site reactions, including redness, swelling, bruising, pain, or irritation Mild fluid retention (edema) Joint or muscle discomfort Headache, dizziness, or flushing Changes in glucose regulation, particularly in individuals with diabetes or prediabetes Itching, restlessness, drowsiness, nausea, or difficulty swallowing (3) Importantly, the occurrence of potential side effects does not predict an individual's overall response to therapy

Methylcobalamin, though more expensive, is often selected for cases requiring neurologic support