hcg and b12 injections side effects Methylcobalamin Injection (Vitamin B12) Where and How to Inject

Vitamin B 12 is needed to produce an adequate amount of healthy red blood cells in the bone marrow

Interpretation should consider: Symptoms CBC (especially if basophilia, leukocytosis, etc.) Liver function tests Renal function Inflammatory markers Even high serum cobalamin levels can be accompanied by functional deficiency Suggested Workup for Unexplained High B12 : Repeat B12 measurement off supplements Check: Liver enzymes CBC with differential Serum creatinine Holotranscobalamin active fraction of vitamin B12, bound to TCB II 8 Consideration of myeloproliferative neoplasm workup if hematologic abnormalities are present Imaging if malignancy suspected (e.g., abdominal imaging if liver pathology or malignancy is suspected) In summary, while elevated B12 is most often benign and related to supplementation or liver/renal dysfunction, it is essential to rule out underlying hematologic malignancy or solid organ cancer when unexplained or accompanied by abnormal clinical or laboratory findings

The more intense sensations associated with rapid IV infusion are unlikely with IM administration

The reaction is thought to occur due to impurities in the B12 injection, notes Drugs.com