Vitamin B6, also known as pyridoxine, is a water-soluble vitamin that plays a vital role in the metabolism of amino acids, carbohydrates, and lipids. It also helps in the production of neurotransmitters like serotonin and norepinephrine, which regulate mood and cognitive function. Adequate intake of vitamin B6 is necessary for maintaining a healthy immune system and preventing chronic diseases such as heart disease and cancer. Symptoms of vitamin B6 deficiency include skin inflammation, anemia, depression, confusion, and weakened immune system function.