2. Kev tu tawv nqaij, collagen yog qhov zoo rau ntawm daim tawv nqaij yog kom muaj peev xwm ua tau zoo ntawm daim tawv nqaij, kev zoo nkauj, vim collagen muaj kev ua haujlwm ntawm kev tu tawv nqaij, tuaj yeem tswj cov tawv nqaij elasticity, tswj nws cov moisturizing thiab lub teeb elasticity, kho cov tawv nqaij puas. , zoo firm daim tawv nqaij, wrinkle, tswj moisturizing;