On The Go B12 Injection at enTrust Urgent Care Center Clinic Some Types Of Vitamin B12 Supplements Can Cause This Side Effect Vitamin B12 Injections (Cyanocobalamin Injections) Mountainside Medical Vitamin B12 Injection Hela Medical Spa Fun Fact Friday! Ever wondered Why is my B12 injection red? All B12s are cobalamins they have a cobalt atom at the center of a special ring shaped molecule called Vitamin B12 deficiency can cause symptoms like headaches, fatigue, depressive mood, gastrointestinal issues, and more. While vegetarians are at a higher risk of vitamin B12 deficiency, it can affect non vegetarians too. Check