What Happens If You Inject B12 Wrong: 6 Red Flags When the marrow wakes up potassium disappears B12 replacement triggers a metabolic surge Cells pull potassium inside serum levels crash The recovery phase is actually the danger Drastic color change in my patients urine after receiving a CyanoKit. : r mildlyinteresting Vitamin B12 Screen Dublin Health Screening Vitamin B12: Urine discolouration could mean you're talking too many supplements Express.co.uk How Long Does a B12 Shot Last In Your Body?