do b12 injections cause headaches Headache: The Link Between Vitamin B12 and Benefits of Vitamin B12 Shots

Increased blood concentration of homocysteine is another nonspecific biomarker of vitamin B 12 deficiency that has been linked to depressive symptoms in the elderly (108)

Initially, frequent injections may be required to build up a sufficient store of vitamin B12

If youre improving clinically (symptoms trending better) but your number is still catching up, your clinician may continue the same plan and recheck later

These effects are rare and typically resolve within a few hours

Patients should be reassured that injection site lumps, whilst inconvenient, are generally not serious and can be effectively prevented with proper technique and site rotation