Hyaluronic Acid is a natural polysaccharide (large sugar molecule) that occurs in various tissues (skin, synovial fluids of joints, connective tissues). Responsible for tissue hydration, lubrication, & tissue stability, holds 500 times its own weight of water. Molecular weight 800-1500kDa. Shelf-life up to 3 years if stored protected from humidity and microbial contamination. Most powerful moisturizer and humectant available. Provides smoothness and softening to the skin. Can reduce the appearance of wrinkles. Ideal ingredient after skin peels.