I took and gave my ferrets shark cartilage for years. I cannot remember what I read to get me started on that. But about 10 years ago, I attended a continuing education seminar given by health specialists. "The only one shark cartilage is good for is the shark." I have not forgotten those exact words given by a doctor who was lecturing for the Institute for Natural Resources (INR) that day. Maybe 10 years from now they will reverse the findings. But I stopped using the cartilage and saved a bundle. [Posted in FML 7353]