Support energy, mental clarity, and overall wellness with our Hydroxocobalamin (B12) IM injection. This essential B vitamin helps support energy production, nerve function, and metabolism so you can feel your best. What syringe volume and needle gauge and length are appropriate for intramuscular vitamin B12 (cobalamin) injection in an adult, and what is the recommended dosing regimen? B12 vitamin Store How to inject B12 in your arm Benefits of B12 Injections for Optimal Health How to Give Yourself a B12 Injection ThinWorks Glow Up