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This autoimmune condition affects the stomach's ability to produce intrinsic factor, so you can't absorb vitamin B12 through your digestive system

Vitamin B12 deficiency can cause significant neurological impairment, stressing the importance of early diagnosis and treatment. Forms of B12: Why Methylcobalamin Matters for Nerve Pain Methylcobalamin is the best B12 for nerve pain

While oral bioavailability is lower than subcutaneous administration, these studies established that even high oral doses maintained excellent safety profiles, though higher doses (54 mg) were associated with increased gastrointestinal discomfort

In 1993, Sikiric said, he signed a contract with PLIVA