Acetyl tetrapeptide-3 does not directly reduce DHT, but it does enhance hair follicles' resistance to DHT. It stimulates the hair papilla and accelerates ECM protein synthesis, increasing the volume of hair follicles; Repair epidermal-dermal junction (DEJ), promote hair fixation within hair follicles, and stimulate Chemicalbook hair growth; It also effectively reduces hair loss due to aging, resulting in thicker, more natural, softer and firmer hair. At the same time, acetyl tetrapeptide-3 can work synergistically with other raw materials that inhibit 5α-reductase to prevent hair loss and hair growth, and achieve the effect of 1+1>2.