Intrinsic factor antibodies are much less sensitive than parietal cell antibodies, but they are much more specific
If fatigue is severe, sudden, or unexplained, bring it to your clinician B12 is one possible factor, but it's not the only one worth ruling out
Vitamin B12 does not thin the blood

Manufactured by: Gland Pharma Limited Hyderabad, India Revised: November 2022 Vial Label - 1 mL: NDC 68083-449-01 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 68083-449-25 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 68083-561-01 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 68083-561-25 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 Vial Label - 30 mL: NDC 68083-562-01 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 68083-562-01 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

Common side effects: Injection site discomfort Mild diarrhea Hot flashes Dizziness or itching Precautions: Avoid B12 injections if youre allergic to cobalt or have Lebers hereditary optic neuropathy