The collagen that is included in face creams comes from animal skin.面霜中的胶原蛋白取自动物皮层。The collagen that is included in face creams comes from animal skin.面霜中所含的胶原蛋白来自动物皮肤。Exposure to sunlight inhibits the ability of fibroblasts to produce collagen.受阳光辐射会抑制成纤维细胞生成胶原蛋白。