Vitamin B6 is responsible for the function of more than 60 enzymes in the human body. These enzymes are essential in energy production, protein synthesis and the production of haemoglobin in red blood cells and antibodies which are key to a healthy immune system. Vitamin B6 also benefits the central nervous system and metabolism. Here, its roles include turning food into energy and helping to create neurotransmitters, such as serotonin and dopamine.