Manufactured in Switzerland by Teoxane Laboratories, the Teosyal® dermal fillers range consists of several monophasic hyaluronic acid-based products. Teosyal® patented technology incorporates reduced protein and bacteria endotoxin levels reducing the occurrence of hypersensitivity reactions. As a safe, reliable and long-lasting product, Teosyal® dermal fillers remain highly popular. The Teosyal® RHA (resilient hyaluronic acid) range utilises a formula of hyaluronic acid which is designed to resist the degradation caused by movement, as the body naturally breaks down injected hyaluronic acid. Teosyal® RHA 4 is suitable for the restoration of volume to extended and expansive areas.