Feeling exhausted, run down, foggy or low this winter? Cold weather, darker days and busy schedules can drain your energy fast and that's where a B12 injection can make all the difference How Long Does a B12 Shot Last? LiveVibrant Wellness Guide Vitamin B12 Monthly Injection Dose: Typical Dosages & Administration Methods Liv Hospital Vitamin B12 Injections: What You Need To Know Can I Take Vitamin D and B12 Together? Invigor Medical 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.