Since cats can't talk I would like to know if they have pain with this condition, or weakness, and numbness
These may include: Nausea and stomach upset Diarrhea Constipation Injection site redness or swelling Itching Headache Dizziness Blood clots Swelling In rare cases, some people may experience an allergic reaction to vitamin B12, which can cause symptoms such as hives, difficulty breathing, and swelling of the face, lips, tongue, or throat
professional B12 injections
The more underlying issues you have, your body will likely protest and need extended adjustment time when flooded with B12 Are Certain Types of B12 Injections More Likely To Cause Symptoms
B12 injections are an effective way to quickly restore optimal levels, promoting sustained energy, improved focus, and enhanced well-being