Vitamin B1, B2, B6 & B12 Injections Prity Skincare Clinic Giving vitamin B12 parenterally? Which electrolyte should you check first? Answer: Potassium. And why does it matter? Because rapid correction of severe B12 deficiency can trigger a surge in Injection Therapy Integrated Health Clinic Why Your Body Needs Vitamin B12 and D3 for Energy, Focus, and Immunity Bliss Welness Compounded Methylcobalamin (Vitamin B12) Injection, 5mg mL