Carnosine

In the body, carnosine occurs naturally as a building block of proteins, made from the amino acids histidine and alanine. The version used in skincare is a synthetic peptide engineered to mimic that natural compound. Applied topically, it offers soothing and antioxidant benefits, helping protect skin from oxidative stress and supporting broader anti aging effects.

Some research also points to carnosine having antiglycation properties, meaning it may help counteract glycation, a process tied to wrinkle formation. It's also been linked to increased collagen production, though like most peptides, whether it actually delivers that benefit depends heavily on the formula. It needs the right delivery system to reach the layer of skin where it can do its job.