Changes in Urine Color: What Causes It and What Could It Mean? Manchester Urology Associates, PA Vitamin B12: Urine discolouration could mean you're talking too many supplements Express.co.uk B12 Injections: How They Work and Who Needs Them Meo Nutrition B12 Shots at Home: How, Where & How Often to Inject Yourself AZ IV Medics 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