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 Ever wonder why B12 shots are red? Here's the scoop! , B12 injections naturally have a deep red color due to the presence of the cobalt corrin complex, a key component of its molecular structure. B12 Injections at Olympia Vitamin B12 Injection in Harrow Just 30 B12 INJECTION Infusion Services South Texas Family and Urgent Care Clinic Infusion Center McAllen