arm hurts after b12 injection Why do I feel worse a injection? Why Does My Arm Hurt

[1] [4] Mood changes including low mood, irritability, or anxiety can be associated with declining B12 levels, though these symptoms are non-specific and can have many causes

When NAD+ levels are adequate, SIRT1 activity increases, promoting DNA repair, reducing inflammation, and enhancing stress resistance

Since B12 contains cobalt, people with known sensitivities should not receive injections

The injection is quick and typically takes less than 10 minutes, making it a convenient addition to your routine

This is uncommon but might contribute to symptoms in some patients, particularly those taking certain medications like diuretics