I have not done recent bloodwork to awe if this product has made a difference in his levels. I'm hoping it has. He eats it well mixed with his diet. I am frustrated by the bags not closing. 3rd bag in with this and it does not close. I find the product gets caked together and not easy to dose out with the scoop. I have used a bag clip and put the original pack in a sealed container to try to stop this from happening.