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This Vitamin B6 Test measures the amount of vitamin B6 in the blood. Vitamin B6 is essential in the production of serotonin and norepinephrine which are used to transmit signals in the brain. Deficiencies in vitamin B6 can cause anemia, lethargy, and in some instances, conjunctivitis (pink eye). Foods such as grains, vegetables, fish, and dairy products are rich in vitamin B6. To discern a vitamin B6 deficiency, Priority Lab Testing offers accurate and reliable results with our Vitamin B6 Test.