Considering Lipo B12? Find Out If You're a Good Candidate Are There Any Side Effects from B12 Injections? Harley Laser Specialists London B12 Shots vs. IV Infusions: What is the difference? Integrative Medicine, Laser and Aesthetics 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 B12 Injections at Home Safety Guide for Self Administration Infusion For Health Low B12 levels can lead to fatigue, numbness, irritability, and moreyet many people don't realize they're deficient. The good news? Testing and treatment are simple with options like injections or dissolvable tablets.