Today,
Chondroitin made of sharks in the market
contains only Type C and Type D.
Chondroitin Sulfate made of chicken contains Type A.
So, we recommend this material to you to supply Type A, which human loses in older age.
Among these groups, human has 2 types, especially Type A (Sulfate 4) and Type C (Sulfate 6),
and mainly Type A is decreased by age. (Right graph as reference).