Used primarily in the treatment of vitamin B12 deficiency, it helps in correcting anemia and improving nerve function. It is also employed in emergency settings as an antidote for cyanide poisoning, where it binds to cyanide to form cyanocobalamin, a non-toxic compound that is excreted in urine. Additionally, it is utilized in certain diagnostic tests to assess vitamin B12 absorption and metabolism. It is used for prevention and treatment in patients with absorption issues, such as gastrointestinal disorders or post-gastrectomy. Its stability and effectiveness make it a preferred form of B12 in clinical and therapeutic applications.