Quality Of Life Labs Cartilast Cartilage & Joint Support - 60 Vegetarian CapsulesQuality Of Life Labs Cartilast Cartilage & Joint Support features ASU (avocado soy unsaponifiables) - a natural ingredient made from avocado and soybean oils that may not only help protect existing cartilage but help rebuild new cartilage - plus joint-supportive vitamins and minerals. A joint is the place where two bones are connected. The bones are covered with a layer of slippery cartilage, which enables them to glide against each other seamlessly. Unfortunately, as we age, the cartilage begins to wear out. The key to healthy joints is healthy cartilage. If you want to look beyond joint comfort and joint mobility, it"s important to make sure your cartilage is in good shape! Supports healthy joint function with all four ingredients. May help protect existing cartilage. ASU may protect cartilage from erosion. May help build new cartilage. ASU may increase the synthesis of collagen and proteoglycans. About the IngredientsVitamins D3 (cholecalciferol)Vitamin D is often called the "sunshine vitamin" because the body can synthesize it when sunlight exposure is adequate. However, researchers have discovered that vitamin D insufficiency is surprisingly common, affecting as much as 70 percent of the population. Vitamin D is a great multi-tasker: It strengthens bone by aiding calcium absorption, modulates immune function, protects prostate cells, and boosts brain chemicals needed for positive mood. Vitamins D3 is better absorbed than vitamin D2.Vitamin K2 (VitaMK7)Vitamin K is found in leafy green vegetables, olive oil, and miso. It was first recognized for its role in helping blood coagulate, but it is a key player in bone health as well. In fact, vitamin K directs calcium from the bloodstream into the bones, regulates several proteins found in bone, and is though to support bone mineralization.