Any extra is simply excreted out of a cats body through the urine
Prepared by FDA-registered, state-board-regulated pharmacies following USP sterility and potency standards

Mahwah, NJ 07430 USA Product of France Revised: January 2025, V-03 Cyanocobalamin Injection, USP 1,000 mcg/mL For Intramuscular or Subcutaneous Use Only 1 mL Multiple-Dose Vial Rx only Cyanocobalamin Injection, USP 1,000 mcg/mL For Intramuscular or Subcutaneous Use Only 10 x 1 mL Multiple-Dose Vials Rx only Cyanocobalamin Injection, USP 1,000 mcg/mL For Intramuscular or Subcutaneous Use Only 25 x 1 mL Multiple-Dose Vials 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 Rx only Cyanocobalamin Injection, USP 10,000 mcg/10 mL (1,000 mcg/mL) For Intramuscular or Subcutaneous Use Only 10 x 10 mL Multiple-Dose Vials Rx only Cyanocobalamin Injection, USP 10,000 mcg/10 mL (1,000 mcg/mL) For Intramuscular or Subcutaneous Use Only 25 x 10 mL Multiple-Dose Vials 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 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 Rx only Cyanocobalamin Injection, USP 30,000 mcg/30 mL (1,000 mcg/mL) For Intramuscular or Subcutaneous Use Only 5 x 30 mL Multiple-Dose Vials Rx only Cyanocobalamin Injection, USP 30,000 mcg/30 mL (1,000 mcg/mL) For Intramuscular or Subcutaneous Use Only 10 x 30 mL Multiple-Dose Vials Rx only

Once absorbed, it binds to plasma proteins before it is transported around the body
Similar patterns have been found in oral cancer and in patients receiving immunotherapy, where elevated B12 has been associated with poorer outcomes
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