Self injecting vitamin B12. Quick and painless jabs after a B12 by Dr Caroline Palmer Medium Vitamin B12 Deficiency as a Cause for Numbness and Tingling If you've been feeling weak, foggy, or experiencing numbness in your hands and feet, it could be a sign of vitamin B12 deficiency. B12 is essential for nerve function and red blood post b12 injection pins and needles Pernicious Anaemia That pins and needles feeling might be more than poor posture. When this feeling keeps coming back, it could point to an underlying health concern. , Conditions such as vitamin B12 deficiency, early B12 Injections: A Solution for Neuropathy Pain Relief