How Quickly Can I Expect to Feel Better After a B12 Injection? Copco Hydra Sports Water Bottle 20 Ounce Non Slip Sleeve BPA Free Tritan Plastic Reusable : Target 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 Vitamin B12 is essential for your body. It plays a key role in DNA synthesis, energy production, and maintaining a healthy central nervous system. A deficiency in Vitamin B12 often develops gradually, Why Do I Feel Worse After My B12 Injection? Causes & Management Bolt Pharmacy Rosemary Rice Water Spray 4oz Baja Basics