Leuphasyl is a synthetic peptide used in skincare products and cosmetics. It is a type of neuropeptide that targets the expression of certain proteins in the skin associated with facial muscle contractions. Leuphasyl works by mimicking the action of natural proteins involved in regulating muscle movement, specifically targeting the formation of wrinkles caused by repetitive facial expressions. By inhibiting the release of certain neurotransmitters, Leuphasyl aims to reduce the intensity and frequency of muscle contractions, leading to a temporary smoothing effect on the skin. This ingredient is often included in anti-aging formulations to help minimize the appearance of dynamic wrinkles, such as crow's feet and frown lines.