2. Kev saib xyuas tawv nqaij, collagen zoo rau tawv nqaij yog kom muaj peev xwm saib xyuas tawv nqaij, zoo nkauj, vim collagen muaj lub luag haujlwm ntawm kev noj qab haus huv ntawm tawv nqaij, tuaj yeem ua kom tawv nqaij elasticity, tswj nws cov moisturizing thiab lub teeb elasticity, kho cov tawv nqaij puas tsuaj, ua kom tawv nqaij ruaj khov, wrinkle, tswj cov moisturizing;