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On This Page Cyanocobalamin Description Cyanocobalamin Injection, USP is a sterile solution of cyanocobalamin for intramuscular or subcutaneous injection

First, side effects are clearly dose-dependent, increasing as the dose goes up

Who is more likely to have low B12 Vegetarians and vegans, since B12 comes mainly from animal foods Adults over 50, because absorption naturally declines with age People with gut conditions such as celiac, Crohn, or past GI surgery Long-term users of metformin or acid-reducing medications People who have had weight-loss (bariatric) surgery Those with heavy or frequent alcohol use If you see yourself in that list, a simple blood test is the logical next step

From 250 UKAS Accredited Diagnostics Walk-in blood testing carried out by qualified nurses, with results reviewed by GMC registered doctors

[56] [57] Low levels of serum vitamin B 12 may be caused by other factors than B 12 deficiency, such as folate deficiency, pregnancy, oral contraceptive use, haptocorrin deficiency, and myeloma