Some pharmacies fill the syringe for you, so all youll need to do is inject it
But, its safer to get help from a doctor, even more so for IV shots or if you have health issues
Reference: Nicotinamide N-Methyltransferase in Cardiovascular Diseases: Metabolic Regulator and Emerging Therapeutic Target (2025)
The time it takes for B12 treatment to work depends on several factors, including the severity of deficiency, the route of administration, and individual patient characteristics
Continue daily injections until symptoms stop improving, because some of them may not be fully reversible
For those incorporating it into a weight loss program, injections are typically scheduled once per week to maintain energy and support metabolic function