Theanine (L-theanine) ek amino acid hai jo mainly tea leaves se aata hai. Skincare mein isko antioxidant aur skin-soothing properties ke liye use karte hain. Yeh oxidative stress ko kam karne mein madad karta hai aur skin ko calm aur relaxed rakhta hai. Sensitive skin ke liye bilkul perfect hai aur irritation ko reduce karta hai.