ife 4PETS ingredients DO matter. That's why we only use Krill oil instead of Salmon (Fish) oil. Our formula for both dogs and cats is carried in phospholipid form (for super-absorbency) and, together with Astaxanthin, is co-absorbed and delivered directly to the body’s cells. We add the Astaxanthin as it is a powerful antioxidant that protects EPA and DHA from oxidative and free radical damage. Our manufacturing process is of the highest quality, using state of the art technology and superior ingredients to ensure the most stable, high impact formulas for your pet.