Reported reactions are uncommon and usually mild/transient, including: Mild injection-site irritation, redness, or itching Transient headache or light-headedness Temporary changes in energy levels or appetite Rare mild gastrointestinal discomfort If any severe or persistent symptoms occur (e.g., rapid heartbeat, severe headache, or signs of allergic reaction), discontinue use and contact your healthcare provider immediately
Polycythemia Vera : May trigger symptoms early after B12 injection
If your test results show higher than normal levels, your doctor will probably order more tests to check your liver health
In rare cases, a person can react to the injection solution
Frohman, Pulsatile Secretion of Growth Hormone (GH) Persists during Continuous Stimulation by CJC-1295, a Long-Acting GH-Releasing Hormone Analog, The Journal of Clinical Endocrinology & Metabolism, Volume 91, Issue 12, 1 December 2006, Pages 47924797, [3] Heffernan M, Summers RJ, Thorburn A, Ogru E, Gianello R, Jiang WJ, Ng FM
Intramuscular injections of vitamin B12 are widely used as a standard treatment for vitamin B12 deficiency
