Vitamin B12 is essential for the body's proper functioning and is found in foods of animal origin. It is produced by certain bacteria that, in addition to being found in nature, are cultivated at industrial facilities for commercial use, primarily by the food and pharmaceutical industries. It is beneficial when certain nutritional deficiencies are present, and in recent times it has become popular, along with other B vitamins, as a remedy for hangovers, as it can help reduce fatigue.