Nowadays, destructive and immunosuppressive effects from long-term exposure to UV radiation have been fully investigated and documented in the literature. UV radiation is known as the main cause of skin aging and carcinogenesis. Hence, skin protection against anti-oxidative and immunosuppressive processes is highly in demand. Now, plant polyphenols have been found as a versatile and natural tool for the prevention and treatment of various skin diseases. The presence of a large number of hydroxyl groups in the cyclic structure of polyphenols has induced valuable biological activities. Among them, their UV protective activity has attracted lots of attention due to promising efficacy and simple instruction to use.

如今，长期暴露于紫外线辐射中产生的破坏性和免疫抑制作用已得到充分研究，并在文献中得到了证明。紫外线辐射被认为是皮肤衰老和致癌作用的主要原因。因此，非常需要针对抗氧化和免疫抑制过程的皮肤保护。现在，已经发现植物多酚是预防和治疗各种皮肤疾病的通用且天然的工具。多酚的环状结构中大量羟基的存在已诱导了有价值的生物活性。其中，由于其有前途的功效和简单的使用说明，其紫外线防护活性已引起了广泛的关注。