Kev tu tawv nqaij yog lub ncauj lus ntawm kev txhawj xeeb loj hauv lub neej niaj hnub. Qab nws lus dag muaj cov ntsiab lus ua haujlwm tshawb fawb ua hauj lwm, uas tau tsim los pab tib neeg muaj daim tawv nqaij zoo nkauj thiab zoo nkauj.
Raws li cov tawv nqaij loj tshaj plaws ntawm tib neeg lub cev, daim tawv nqaij muaj cov haujlwm tseem ceeb xws li kev tiv thaiv, tswj lub cev kub, thiab hnov cov stimuli sab nraud. Txawm li cas los xij, nrog rau nce ntawm lub hnub nyoog, xws li ultraviolet rays, thiab lwm yam ntawm cov tawv nqaij tsis zoo, thiab lwm yam. Qhov no yog qhov tseem ceeb ntawm kev tu tawv nqaij.
Kev ntxuav kom huv yog thawj kauj ruam hauv kev tu tawv nqaij. Lub luag haujlwm tseem ceeb ntawm kev ntxuav khoom (xws li cov tshuaj ntxuav kom huv (xws li tshuaj ntxuav ntsej muag, thiab lwm yam) yog kom tshem tawm cov av, roj thiab pleev xim rau saum npoo ntawm daim tawv nqaij. Lawv ua tiav lub hom phiaj ntawm kev ntxuav los ntawm emulsifying los yog discolving cov impurities nrog dej los ntawm emulsification los yog kev xaus ntawm surfactants. Txawm li cas los xij, kev tu kom ntau dhau tuaj yeem ua rau cov teeb meem kev puas tsuaj ntawm daim tawv nqaij, yog li nws yog qhov tseem ceeb los xaiv cov khoom ntxuav kom haum rau koj hom tawv nqaij.
Moisturizing yog ib qho ntawm cov ntsiab lus tseem ceeb ntawm kev tu tawv nqaij. Cov dej noo cov ntsiab lus ntawm cov tawv nqaij ncaj qha cuam tshuam nws cov mos muag, elasticity thiab luster. Moisturizing khoom (xws li lotions, cream, thiab lwm yam.
Antioxidation tseem yog ib feem tseem ceeb ntawm kev tu tawv nqaij. Dawb radicals yog ib qho tseem ceeb ua rau kev laus tawv nqaij. Lawv tawm tsam cov roj ntsha xws li DNA, protein thiab lipids hauv cov tawv nqaij thiab rhuav tshem cov tes haujlwm ntawm tes. Antioxidant cov khoom xyaw (xws li vitamin C, Vitamin E, anthocyanins, thiab lwm yam) tuaj yeem cuam tshuam rau daim tawv nqaij, thiab ncua kev laus tawv nqaij.
Ib qho ntxiv, kev tu mob tawv ncauj kuj cuam tshuam lub hnub tiv thaiv, uas tuaj yeem tiv thaiv kev puas tsuaj rau cov tawv nqaij, tiv thaiv kev tshav ntuj, tanning thiab kev yees duab. Hauv ntej, nkag siab txog lub hauv paus kev ua haujlwm ntawm kev saib xyuas tawv nqaij tuaj yeem pab tib neeg ua kom cov tawv nqaij saib xyuas thiab muaj tawv nqaij zoo nkauj thiab zoo nkauj thiab zoo nkauj thiab zoo nkauj.
