N-Acetylglucosamine ek amino sugar hai jo hyaluronic acid ka precursor hai, aur iska use skincare mein hydration support karne aur hyperpigmentation kam karne ke liye hota hai — especially jab niacinamide ke saath combine kiya jaye. Yeh tyrosinase activity ko bhi rok sakta hai, jisse dark spots aur uneven skin tone improve hone mein madad milti hai.