I have post about shark. About the skin and the bone. I was got some information about the shark’s bone. The Chondroitin merged with Glucosamine Hcl can be useful as nutritional supplements. It can use for :

Treatment Option
Exercises
Pain Reliver
Heat/cold therapy for temporary pain relief
Joint protection to prevent strain or stress on painful joints
Surgery (sometimes) to relieve chronic pain in damaged joints
Weight control to prevent extra stress on weight-bearing joint

Now, some factories in China are producing this nutritional supplements.

Note :
Chondroitin is the most abundant glycosaminoglycan in cartilage and is responsible for the resiliency of cartilage.
Glucosamine is a precursor to a molecule called a glycosaminoglycan-this molecule is used in the formation and repair of cartilage.

They are extracted from animal tissue ; Glucosamine from crab, lobster, or shrimp shells. And Chondroitin from animal cartilage such as shark cartilage.

Nice to share, Thank you :D

GBU