The skin biopsies showed increased production of glycosaminoglycan and procollagen -- structural components of the skin -- on the arms that received the retinol lotion.

• 皮肤活检揭示了涂抹视黄醇润肤乳后，手臂皮肤结构成分中的葡糖胺聚糖和前胶原含量增多。