B Complex vitamins are usually not synthesized or stored by the body, so that it is necessary to consume them daily in adequate and meaningful doses. These vitamins can mainly be found in products of animal origin: meat, fish, poultry, eggs and dairy or derivatives.B complex vitamins are important for the metabolism of macronutrients ( carbohydrates, proteins and fat). These vitamins function like coenzymes that are crucial for cell breathing, and are also fundamental to provide energy. They play a vital role in nervous impulse transmission. They facilitate and optimize the production of energy from nutrients, allowing regular physical exercise, and also stimulates cognitive function and intellectual capacity.