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According to a study published in Frontiers in Pharmacology, intramuscular administration of vitamin B12 produces a faster increase in serum levels compared to oral routes, although both methods are effective in restoring normal cobalamin levels in patients with deficiency

Understanding Vitamin B12 and Its Importance Vitamin B12 is key for many body functions

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Frequent infections: These can also be symptoms of a vitamin B12 deficiency and may be accompanied by lightheadedness