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This is significant because 90% of the bodys serotonin is produced in the gut

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DISCUSSION The deficiency of vitamin B12 often manifests as hematological and neurological findings

Interpreting Your Vitamin B12 Test Results Normal reference ranges for vitamin B12 can vary slightly between labs, but generally: Normal : 200-900 pg/mL Borderline : 200-300 pg/mL (often requires further investigation or clinical correlation) Deficient : 200 pg/mL If your levels are low, your doctor will discuss treatment options, which may include dietary changes, oral supplements, or injections

doi:10.1155/2014/465623.CrossRefGoogle Scholar Yakoob, M, Bhutta, Z