Interestingly most sources I could find on the web say categorically that “No natural food sources of glucosamine exist”, while the the supplement is made from

Interestingly most sources I could find on the web say categorically that “No natural food sources of glucosamine exist”, while the the supplement is made from sea shells. All resources related to canine health on the other hand mention cartilage, bone marrow and beef trachea as rich in glucosamine... someone is being dishonest there.