Natural polyphenols, such as green tea polyphenols, grape seed proanthocyanidins, resveratrol, silymarin, and genistein, exhibit photoprotective effects against UV-induced skin inflammation, oxidative stress, and DNA damage. These compounds inhibit UV-induced skin diseases by reducing inflammation, oxidative stress, and DNA damage through various mechanisms, including anti-inflammatory, antioxidant, and DNA repair activities. Animal studies suggest that these polyphenols can protect the skin from UV radiation, potentially reducing the risk of skin cancer. They may complement sunscreen use and be beneficial for skin diseases caused by UV radiation. Polyphenols act as sunscreens by absorbing UV radiation, reducing its penetration into the skin. They also inhibit UV-induced inflammation by suppressing COX-2 expression and prostaglandin production, and by reducing inflammatory responses. Additionally, polyphenols exhibit antioxidant effects by reducing reactive oxygen species and oxidative DNA damage. They also promote DNA repair through mechanisms such as nucleotide excision repair. Green tea polyphenols, in particular, have been shown to repair UV-induced DNA damage by stimulating cytokine production, such as IL-12, which is involved in DNA repair. These findings suggest that polyphenols may be effective in preventing UV-induced skin diseases and cancers. The bioavailability and metabolism of polyphenols can influence their effectiveness, with some compounds being more readily absorbed than others. The use of polyphenols in combination with sunscreens or skin care products may provide an effective strategy for mitigating UV radiation effects and protecting the skin from various skin diseases caused by excessive sun exposure.Natural polyphenols, such as green tea polyphenols, grape seed proanthocyanidins, resveratrol, silymarin, and genistein, exhibit photoprotective effects against UV-induced skin inflammation, oxidative stress, and DNA damage. These compounds inhibit UV-induced skin diseases by reducing inflammation, oxidative stress, and DNA damage through various mechanisms, including anti-inflammatory, antioxidant, and DNA repair activities. Animal studies suggest that these polyphenols can protect the skin from UV radiation, potentially reducing the risk of skin cancer. They may complement sunscreen use and be beneficial for skin diseases caused by UV radiation. Polyphenols act as sunscreens by absorbing UV radiation, reducing its penetration into the skin. They also inhibit UV-induced inflammation by suppressing COX-2 expression and prostaglandin production, and by reducing inflammatory responses. Additionally, polyphenols exhibit antioxidant effects by reducing reactive oxygen species and oxidative DNA damage. They also promote DNA repair through mechanisms such as nucleotide excision repair. Green tea polyphenols, in particular, have been shown to repair UV-induced DNA damage by stimulating cytokine production, such as IL-12, which is involved in DNA repair. These findings suggest that polyphenols may be effective in preventing UV-induced skin diseases and cancers. The bioavailability and metabolism of polyphenols can influence their effectiveness, with some compounds being more readily absorbed than others. The use of polyphenols in combination with sunscreens or skin care products may provide an effective strategy for mitigating UV radiation effects and protecting the skin from various skin diseases caused by excessive sun exposure.