Max Muscle contains lysine and methionine, which are essential amino acids needed to build and repair muscle tissue. Lysine and methionine can also promote muscle endurance by increasing the body's oxygen uptake and reducing the production of lactic acid. Max Muscle contains selenium, zinc and manganese, which are essential for the dog's metabolic process and are required to build muscle. Vitamin E and selenium are two of the most important antioxidants for the dog's muscles. Antioxidants break down and remove the free radicals that build up in the dog's muscles during training and intense exercise. Max Muscle is formulated with a tasty, beneficial prebiotic yeast culture that acts to stabilise the gut flora and improve nutrient absorption. Use: For dogs that experience muscle stiffness or easily get muscle fatigue. For active or hard-working dogs. 600 g.