The Ordinary Matrixyl 10% + HA is a peptide anti-aging serum built on Sederma's Matrixyl 3000 complex (Palmitoyl Tripeptide-1 + Palmitoyl Tetrapeptide-7) plus Matrixyl Synthe'6 (Palmitoyl Tripeptide-38), with sodium hyaluronate for hydration. Signal peptides work by mimicking the tiny protein fragments your skin produces when collagen naturally breaks down, essentially telling skin cells "repair is needed here" — a slow, cumulative process rather than a visible overnight effect. This is a gentle, low-risk supportive product, but don't expect retinoid-level speed or evidence depth from it, and it works best as one piece of a broader anti-aging routine rather than a standalone fix.