I Feel Tired All the Time. Do I Need a B12 Shot?: Shawn Veiseh, M.D.: Family Medicine B12 Shots at Home: NHS Guide to Safe Self Administration Bolt Pharmacy Tired, foggy or feeling run down?, You might be low in vitamin B 12. We now offer B12 injections at our Mold and Chester clinics administered by a qualified podiatrist and prescribed individually by How Quickly Does a B12 Injection Work? Timeline and Expectations Bolt Pharmacy