Hauv tib neeg lub cev, collagen tseem ceeb npaum li lub plawv hauv peb lub cev.Nws pab peb kom cov hluas thiab noj qab nyob zoo.Thaum peb yug los, cov collagen yog qhov siab tshaj plaws, tab sis thaum peb muaj hnub nyoog, collagen deficiency tshwm sim, thiab peb laus dua.Txawm li cas los xij, kev laus tuaj yeem qeeb ...
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