TuffRock PK9JF+ is a powerful blend of collagen minerals synergized with phytonutrients plus Superfood Botanic Vitamins to support the metabolism of fat & enzyme reproduction in active or aged dogs. 5 grams per medium sized dogs delivers 5 % RDI of vitamins A, B, C, E & essential omegas to support stamina, digestive health, joints and natural freedom of movement in super active dogs, ligament or joint challenged dogs of all ages.