The Benefits Of Vitamin B12 Ugly London. Acupuncture & Chinese Herbal Medicine How Often Can I Take B12 Injections? Benefits of B12 Injections Clinic Poster Etsy Gym goers spending monthly on vitamin B and C injections Have a f*cking word with yourself. Both are water soluble, so don't stick around for long in your system (12 14hrs) hence If you have a low vitamin B12 level, injections can go a long way toward improving your health and well being. But if your B12 level is normal, don't fall for claims that