Synthetic peptide (trade name Matrixyl 3000) believed to work by muting the effect of chemical messengers known as interleukins in the skin that trigger an inflammatory response. Also seems to play a role in thickening skin that has become thinner due to age. 
- Mondon P, Hillion M, Peschard O, Andre N, Marchand T, Doridot E, Feuilloley M, Pionneau C, Chardonnet S. Evaluation of dermal extracellular matrix and epidermaldermal junction modifications using matrix-assisted laser desorption/ionization mass spectrometric imaging; in vivo reflectance confocal microscopy; echography; [and other factors]. J Cosmet Dermatol. 2015;14(2):152-60.