How Long Does a B12 Shot Last? Vitamin B12: How Frequently Should I Get It? URBAN Medical Fishersville, VA and Gilbert, AZ A little insight to the importance of the b12 injections. My client hadn't been feeling well & had some bloods done with her GP. The results identified a severe deficiency in b12. B12 Injection Frequency: How Often Should You Get a B12 Shot? Liv Hospital Vitamin B12 Injections Energy Boost The Center Medical