I am trying to weed through all the information on pellets. I want the best food I can get for my two girls and I need food available in Canada. I am in the process of changing over to Oxbow but have some doubts. They have been eating Sun Seed Sunthing Special pelleted food which they like. I talked to the nutrition department at Oxbow and I apparently have the older formula of Cavy Performance. The new formula says Essentials on the package. The expiration date on my bag is Nov. 9, 2012 which according to Oxbow means it was manufactured two years before that on Nov. 9, 2010 which means my food is already 13 months old and I just purchased it. Oxbow says that is okay. I pulled up the ingredients on the Oxbow site and according to their web site both the Cuisine and Performance now have Lignin Sulfonate as the 9th ingredient on one and 7th on the other. I think it is to bind the pellets together? Has anyone got a new bag listing this ingredient or know exactly what it is? There is no corn in these formulas, mine has corn. Is corn worse than Soya beans? I feed my guinea pigs chopped corn husks and have tried raw corn cobs but I wouldn't feed them soya beans. Sun Seed pellets doesn't list a binding agent or Mineral oil. My bag of Performance lists Mineral oil close to the bottom. I have e-mailed Sunseed to make sure they list all ingredients on the packaging. I am waiting for a reply. I would appreciate it if anyone could clarify any of these questions. Thank you.