Check Your Vitamin B6 Levels - Vitamin B6 (Pyridoxine) Test

A vitamin B6 (pyridoxine and its active forms) test measures the plasma level of this essential water-soluble vitamin, or its functional level via metabolites such as xanthurenic acid. B6 plays a central role as a coenzyme in over 100 metabolic reactions, including amino acid metabolism, neurotransmitter synthesis (such as serotonin and dopamine), hemoglobin formation, and immune system function.