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Comparing oral and intramuscular vitamin B12, a 2005 Cochrane Review revised in 2018 revealed that large doses of oral vitamin B12 might be equally effective as intramuscular delivery in achieving short-term hematological and neurological responses in vitamin B12-deficient individuals
For chronic conditions, this could be a lifelong treatment plan
An over-the-counter pill has to survive digestion, and the body absorbs only a small fraction of it
They are typically prescribed when oral supplements are ineffective or when rapid improvement of symptoms is required
Why some causes need intramuscular or lifelong treatment An injection bypasses the gastrointestinal tract
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