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Disclaimer: B12 injections are a wellness treatment provided by licensed medical practitioners

Some patients experience mild soreness at the injection site

Mario Quiros, MD Diplomate of the American Board of Obesity Medicine | Good Hearts Health | Last medically reviewed: June 2026 How many milligrams do I take? and How do I measure that in units on a syringe? these are questions I answer every single day in my weight loss practice

This includes: Patients with malabsorption issues due to gastrointestinal disorders Individuals with pernicious anemia or other conditions that impair B12 absorption Cases where a rapid increase in B12 levels is necessary In these cases, IV delivery gets B12 straight into the blood

Tambin es importante para decidir en la prctica clnica qu pacientes se benefician en mayor medida del tratamiento y as evitar toxicidades innecesarias y reducir costes