b12 injection high dose Vitamin Cyanocobalamin 1000 mcg Multiple-Dose Vials — Mountainside Medical Vitamin B12 Injection: Energy Boost
Description
Methylcobalamin should be taken in the dose and duration advised by your doctor

Methylmalonic acid (MMA) : Elevated levels indicate functional B12 deficiency [*]

And reduce your B12 intake to lower the risk for toxicity

Whats the Verdict on Vitamin B12 for Pain Relief