Tripeptide-10 - This peptide helps stimulate the production of new collagen. The production of collagen is, among other things, controlled by a molecule called decorin. As we age, decorin activity in the skin decreases. Tripeptide-10 works by mimicking decorin, so the skin is activated to produce the same amount of collagen as your younger self. Tripeptide-1 - This peptide is a signaling peptide that works with copper in the skin to visibly repair areas that have been weakened or damaged by age and the sun. It contributes to rebuilding damaged areas of skin cells, making the skin feels softer and firmer.