Vitamin B6 is excreted in the urine as

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Vitamin B6 is excreted in the urine as 4-pyridoxic acid.

Vitamin B6 is also known as Pyridoxine. The three organic compounds that are the vitamers of Vitamin B6 are pyridoxine (C8H11NO3, molecular weight 169 g/mol), pyridoxal (C8H9NO3, molecular weight 167 g/mol), and pyridoxamine (C8H12N2O2, molecular weight 168 g/mol). All the vitamers have a pyridine ring as their core.

The most biologically active form of vitamin B6 is Pyridoxal 5′-phosphate. Vitamin B6 acts as a coenzyme in enzymes that are important for the synthesis of neurotransmitters, hemoglobin synthesis as well as the metabolism of glucose, amino acid and lipid.

Vitamin B6 is absorbed in the small intestine (jejunum) by passive diffusion. The catabolic end-product of vitamin B6 that is excreted through the urine is 4-pyridoxic acid. The normal level of 4-pyridoxic acid in the urine is 128-680 nmol per nmol of creatinine.