Glucosamine is manufactured by the body and is a natural building block of cartilage. Supplementing your body with Glucosamine helps nourish and repair cartilage, which cushions bones and is essential to joint flexibility and comfort. Fish Oil contains EPA and DHA Omega-3 Essential Fatty Acids, vital compounds that support a healthy heart, cholesterol levels, and joint comfort. Vitamin E has been added to help preserve freshness.