Amino acids hain proteins ke building blocks aur natural moisturizing factor (NMF), jo skincare mein use hote hain skin ko hydrate karne, skin barrier ko support karne, aur skin ka pH balanced rakhne ke liye. Ye commonly moisturizers aur serums mein add hote hain kyunki ye skin ko achchi tarah se moisture dete hain aur skin ko healthy rakha lete hain.