only selects Shark Species which are not on the endangered list, therefore ensuring sustainability of this potential life saving supplement.Shark Chondroitin has more effect on human health than Bovine Chondroitin, that is the effect on Eczema and cancer. The 1992 publication of William Lane's book, Sharks Don't Get Cancer, sparked a heated controversy between money-grubbing opportunists and medical orthodoxy. Although sharks do, in fact, occasionally develop cancer, shark cartilage was promoted as a natural "cancer cure" and all around wonder drug. Our Shark Chondroitin Sulfate is derived from pure Shark Cartilage with a content of 80%, 85% and 90%. For some clinic experiments, Shark Chondroitin Sulfate also helps to cure Eczema, but it's not scientifically proved.This is a strong natural material to combat cancer.