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Behavior (violent) - Vitamin B12 Vitamin B12 normal ranges should be 600 to 2000 pg/ml. Below 550 to 600 pg/ml deficiencies start to appear in the CSF. Humans are born with serum levels of about 2000 pg/ml, which decline gradually throughout life. [Medical Hypotheses, 1991;34:131-140. 28725 (1998)] Summary Interview PubMed |
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