Nature's Harbor Rose Hips contain significant amounts of Vitamin C, which is also known as ascorbic acid. Rose Hips also contain citrus bioflavonoid complex that aid in the absorption and retention of Vitamin C. Vitamin C is vital to the production of collagen, which is involved in the building and health of cartilage, joints, skin, and blood vessels. It also increases the body's ability to absorb iron, assists in lowering cholesterol, and boosts the immune system increasing resistance to colds.