[118] Methionine synthase [edit] Methionine synthase, coded by MTR gene, is a methyltransferase enzyme which uses the MeB 12 and reaction type 2 to transfer a methyl group from 5-methyltetrahydrofolate to homocysteine, thereby generating tetrahydrofolate (THF) and methionine
DNA Synthesis: As a vital member of the DNA synthesis process Vitamin B12 facilitates fast immune cell division and multiplication for adequate immune response
A: Injections deliver B12 directly into the muscle for maximum absorption, bypassing the digestive system where much of the vitamin may be lost

Manufactured for: Revised: November 2025 Vial Label - 1 mL: NDC 87188-111-01 Rx Only Cyanocobalamin Injection, USP 1,000 mcg/mL For Intramuscular or Subcutaneous Use Only 1 mL Multiple-Dose Vial Carton Label - 1 mL: NDC 87188-111-90 Rx Only Cyanocobalamin Injection, USP 1,000 mcg/mL For Intramuscular or Subcutaneous Use Only 25 X 1 mL Multiple-Dose Vials Vial Label - 10 mL: NDC 87188-112-01 Rx Only Cyanocobalamin Injection, USP 10,000 mcg/10 mL (1,000 mcg/mL) For Intramuscular or Subcutaneous Use Only 10 mL Multiple-Dose Vial Carton Label - 10 mL: NDC 87188-112-01 Rx Only Cyanocobalamin Injection, USP 10,000 mcg/10 mL (1,000 mcg/mL) For Intramuscular or Subcutaneous Use Only 1 x 10 mL Multiple-Dose Vial Vial Label - 30 mL: NDC 87188-113-01 Rx Only Cyanocobalamin Injection, USP 30,000 mcg/30 mL (1,000 mcg/mL) For Intramuscular or Subcutaneous Use Only 30 mL Multiple-Dose Vial Carton Label - 30 mL: NDC 87188-113-01 Rx Only Cyanocobalamin Injection, USP 30,000 mcg/30 mL (1,000 mcg/mL) For Intramuscular or Subcutaneous Use Only 1 x 30 mL Multiple-Dose Vial

The first dose experience varies considerably from person to person