What is Acetyl Tetrapeptide-3? Acetyl Tetrapeptide-3 is a biomimetic peptide made up of 4 main amino acids that help to stimulate tissue regeneration. Acetyl Tetrapeptide-3 for hair Acetyl Tetrapeptide-3 is known to stimulate the dermal papilla extracellular matrix proteins which in turn has a direct effect on the structures surrounding hair follicles. This can help to anchor the hair fibre into the scalp which can strengthen strands and target the causes of hair loss. By combining this ingredient with Red Clover Extract, the benefits can be accelerated helping to improve blood circulation to the roots, increasing thickness and hair volume.