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Vitamin B6 (pyridoxine) is a cofactor for over 100 enzymatic reactions including amino acid metabolism, neurotransmitter synthesis, and hemoglobin production. Deficiency impairs serotonin and dopamine production, causing depression, confusion, and weakened immunity. Chronic oversupplementation above 100 mg/day can paradoxically cause peripheral neuropathy.
Also known as: B6, Piridoksin, Piridossina, Piridoxina, PLP, Pyridoxal Phosphate, Pyridoxin, Pyridoxine
High B6 from chronic supplementation above 100 mg/day can cause peripheral neuropathy. Low B6 impairs neurotransmitter synthesis, causing depression, confusion, and weakened immunity.
Standard range is 5-50 ng/mL. Functional practitioners target 20-40 ng/mL. Pyridoxal phosphate (PLP) is the biologically active form and is the preferred measurement when functional deficiency is suspected.