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 WESTON HCG CENTER Vitamin B12 injections deliver high doses of this essential vitamin directly into your bloodstream for better absorption than oral supplements to boost energy, support red blood cell production and maintain nerve function. Vitamin B12 Injections: Dosage for Weight Loss thepafp.org B12 Shots at Home: How, Where & How Often to Inject Yourself AZ IV Medics Amazon.com: Neurobion B12 Forte 10 Vials x 10 ml (packaging may vary) : Health & Household