Tetrapeptides chhote chote amino acid ke chain hote hain jo skin cells ko signal bhejte hain. Ye collagen production ko boost karte hain, wrinkles ke look ko kam karte hain, aur skin ko firm aur glowing banate hain. Anti-aging aur firming products mein commonly use hote hain. Mature skin ke liye kaafi acha ingredient hai jo skin texture ko improve karta hai.