The liver is one of the most vitamin and nutrient-rich organs that we ever find on our plates. It is full of amino acids and B vitamins especially, though iron, phosphorus, and vitamins A, C, & D are also well-represented.
Desiccated liver supplements are a convenient way to get all of that nutrition without the calories, fats, and potential toxins that can be found in liver itself as part of a meal. This is simply slow-dried beef liver in tablet form.
Some fans of natural remedies use desiccated liver supplements to support their own liver functions, to fill in nutritional deficiencies, and to increase energy. Liver supplements can also help to build lean body mass.