Vitamin B12 plays a critical role in energy, brain function, and overall cellular health. Methylcobalamin is the active form of B12, meaning your body can use it immediately without needing to convert Vitamin B 12 Injection Mobile and Clinic IV Therapy ASAP IVs IV Hydration Experts of San Diego, Phoenix, Scottsdale, San Francisco NO SHOT B 12 10,000 mcg (as Cyanocobalamin) Superior Source Vitamins Methylcobalamin Injections B12 10,000mcg 30,000mcg Vial