This dietary supplement from the German brand grau is made of 100% pure natural brewer’s yeast (Saccharomyces cerevisiae). Brewer's yeast is a well-known classic among BARF enthusiasts, optimizing the skin and coat. It is also a great source of trace elements, minerals (such as zinc, sodium, potassium, magnesium, phosphorus, sulfur), and vitamins (B complex, E, H biotin), all essential for the immune system, skin, coat, and nails.