Hyaluronic acid, or HA, is a naturally occurring polymer found in every tissue of the body. It is particularly concentrated in the skin and in synovial fluid but decreases with aging. Many sources of HA consist of large molecular weight compounds that are too large to be absorbed in the intestines. In a pharmacokinetic study, orally administered HyaMax® hyaluronic acid was incorporated into joints, connective tissue and skin, with a particular affinity for cartilaginous joints. HA functions include attracting and retaining water in the extracellular matrix of tissues. For skin cells, this is essential for proper cell-to-cell communication, hydration, nutrient delivery, and waste and toxin elimination. It also appears to support the skin by promoting healthy turnover and renewal of keratinocytes, moderating the appearance of fine lines and age spots. For joints, HA is especially supportive of healthy lubrication and shock absorption.