Hydroxycinnamic acid ek phenolic compound hai jo ferulic, caffeic aur p-coumaric acids jaisa kaam karta hai. Isme antioxidant properties hoti hain aur free radicals ko fight karta hai. Skincare mein isko isliye use karte hain kyunki yeh skin ko oxidative damage se protect karta hai aur overall skin health ko support karta hai.