Can Cartigen 1500 Be Taken For Knee Problem Along With Heart Medicine?

My father in law is 73 years old. He is having knee problem Dr told him to knee transplant the last option. one of his friend is also having same problem, he advise him to take Cartigen 1500 (glucosamine sulfate ) Tab . My father in law has done bypass surgery and he is regular taking all his heart tab so is it this cartigen 1500 is safe to take for his.