Solid Gold’s NutrientBoost is a line of recipes created specifically to improve gut health in cats and dogs, powered by plasma. Plasma is a natural, nutrient-rich liquid comprised of vital proteins including albumin, globulin and fibrinogen that actively support the immune system and offer gut health benefits for both dogs and cats, the company states. It is packed full of minerals, amino acids, and antibodies that support the intestinal immune system against harmful bacteria while enhancing the body’s immune response to potential foodborne threats, the company adds. The line includes kibble and meal toppers.