7-Dehydrocholesterol ek cholesterol derivative hai jo naturally hamari skin mein paya jata hai. Jab UVB rays padti hain, toh yeh vitamin D3 mein convert ho jata hai. Skincare mein iska use skin barrier ko strong karne aur protect karne ke liye hota hai kyunki yeh ek provitamin antioxidant ki tarah kaam karta hai. Yeh lipid precursor hai jo skin ke natural defenses ko support karta hai.