Nordihydroguaiaretic acid (NDGA) ek natural lignan-derived polyphenolic antioxidant hai jo creosote bush se aata hai. Yeh skin ke free radicals ko fight karta hai aur oxidative stress se bachata hai. NDGA ko topical skincare mein use kiya jata hai kyunki iska powerful antioxidant action skin ke liye helpful hota hai.