Dietary Supplement. Glucosamine Chondroitin Complex. Improves Mobility*. Improves Joint Comfort*. Supports Renewal of Cartilage* Easy-to-Swallow SmoothCap Osteo Bi-Flex® works by providing the nourishment your body needs to build cartilage, lubricate and strengthen your joints.*. What Can Osteo Bi-Flex® Do for You? As we age, the body is less able to maintain the supportive cartilage structures surrounding joints and bones. Glucosamine is a major building block of joint cartilage, which helps to maintain the structural integrity of joints and conn.