Typically, B12 can be administered either intramuscularly or subcutaneously
Under these conditions, reconstituted material is generally considered stable for up to 30 days
If a vial is multi-dose, follow the label or pharmacist instructions for how long it can be used after opening
People with genetic variants that affect methylation (such as certain MTHFR variants) often choose methylcobalamin, although both forms can correct clear deficiency under medical care
Furthermore, although its very rare, getting too much vitamin B12 can lead to toxicity, says Yuval Pinto, MD, an obesity and family medicine doctor at Johns Hopkins Medicine in Baltimore
Healthcare providers are now prescribing semaglutide with vitamin B12 to prevent lethargy and provide cellular energy for physical activity and exercise