b12 injection peptide 1 ml Cyanocobalamin Injection, 1000 mcg/mL 1mL Vial and cognitive support vitamin b12 injection brand name

12-month shelf life when properly stored in a sealed container

While the effects of a vitamin B12 injected will become noticeable around 24 hours after administration, they will start to take effect almost immediately and will stay in your system for around 1 week, but may vary depending on the metabolic rate of the patient

Journal of Inherited Metabolic Disease

Your provider can help determine how often B Complex shots make sense based on your lifestyle, overall wellness goals, and any other treatments or services you may be receiving

Still, it's best to follow the maximum dosage instructions recommended by your healthcare provider or the label on your vitamin B12 supplements