how long does b12 injection take to work a Shot Last Vitamin B12 Injections: What You

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Remove Air Bubbles Hold the syringe upside down and check for trapped air

Ingredients 1 mg cyanocobalamin, water for injections, sodium hydroxide for pH adjustment, sodium chloride, sodium dihydrogen phosphate 2 water Directions At the beginning of the treatment, 1 ampoule of 1 ml vitamin B 12 Lichtenstein (corresponding to 1000 micrograms of cyanocobalamin) is administered twice a week in the first weeks after diagnosis

The most common side effect of B12 injections is irritation at the injection site, and injections are typically administered intramuscularly or subcutaneously. Less common side effects may include headache, nausea, diarrhea, itching, or a brief feeling of lightheadedness after the injection