At least 1 month
Vitamin B6 is a complex of 6 vitamers: pyridoxal, pyridoxol, pyridoxamine, and their 5'-phosphate esters. Due to its role as a cofactor in a number of enzymatic reactions, pyridoxal phosphate (PLP) has been determined to be the biologically active form of vitamin B6.
Vitamin B6 deficiency is uncommon and due to its function as a cofactor in many reactions of amino acid metabolism., it can have a wide range of symptoms including anemia, itchy rashes, scaly skin on the lips, cracks at the corners of the mouth, swollen tongue, depression, confusion, and a weak immune system. Infants who do not get enough vitamin B6 can become irritable, develop extremely sensitive hearing, or experience seizures.