I have been giving my dog Greta Schiff Glucosamine/MSM for a couple of years. She is 8 1/2 years old and started showing some signs of stiffness. My vet said it was okay to give her that Schiff product, it's for humans but he said no problem. Now I have decided to give her Glucosmaine/Chondroitin instead of MSM because I have come to believe that Chondroitin is superior to MSM. So I picked up a bottle of Spring Valley Glucosamine/Chondroitin. Now I have started looking at the ingredient list and...worrying. The Chondroitin forumla has more sodium, it has 160 mg per her daily dose. I think that's with in reason? It's not the dosage or anything I have questions about, it's that ingredient list with Silicon Dioxide, Stearic Acid, Mangesium Stearate, etc. that has caught my attention. I'll ask my vet, but I know he'll just say it's okay. I don't always trust my vet. I want to make sure. Any thoughts? Has anyone researched this?