Salix Nigra (black willow) bark extract ek natural ingredient hai jo salicin aur tannins se bhara hota hai. Isko skincare mein use karte hain kyunki iska mild astringent aur soothing properties hote hain. Yeh skin ko condition karne mein bhi madad karta hai. Kuch log ise salicylic-acid ka natural source bolte hain.