Muscle relaxants and hyaluronic acid are fundamentally different substances. Muscle relaxants are neurotoxins produced via biotechnological processes that interrupt nerve-to-muscle signals, causing muscle relaxation. Hyaluronic acid is a connective tissue component, but is produced biosynthetically for use in aesthetic medicine. Both are suitable for wrinkle treatments, but their application differs significantly. As a general rule: muscle relaxants are especially effective for dynamic wrinkles; hyaluronic acid is used for static wrinkles. Dynamic wrinkles arise from muscle movements, such as frown lines, forehead wrinkles, and laugh lines at the eye. Static wrinkles are caused by volume loss and tissue sagging, such as nasolabial folds.