In mice, certain chemicals that block harmful oxygen molecules can stop sunburn-like immune suppression caused by UV light—but if you mix those chemicals with sunscreen, they stop working as well, probably because sunscreen gets in the way.

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Evidence from Studies

Supporting (1)

8

Community contributions welcome

8

Effect of inhibitors of oxygen radical and nitric oxide formation on UV radiation-induced erythema, immunosuppression and carcinogenesis.

Cohort Study

Animal

1999

Scientists found that adding special antioxidants to sunscreen helps protect mice from UV damage, especially skin cancer, and stops UV from weakening their immune system — just like the claim says. But the antioxidants didn’t make the sunscreen better at protecting the immune system, which is surprising but doesn’t mean they don’t work.

Contradicting (0)

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No contradicting evidence found

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According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.

Source Study

Effect of inhibitors of oxygen radical and nitric oxide formation on UV radiation-induced erythema, immunosuppression and carcinogenesis.

Score: 8

DOI: 10.1179/135100099101535016

Similar Assertions

In mice, certain antioxidants reduce skin swelling after sun exposure, which means free radicals cause inflammation—but they don’t help sunblock stop immune suppression, so these two effects happen through different paths.

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90%

When mice get too much sun, certain harmful molecules in their skin cause redness, weaken their immune response, and can lead to skin cancer. Blocking these molecules helps sunscreens work better than just blocking UV rays.

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When mice are exposed to sunlight-like UV rays, adding two special chemicals to sunscreen barely boosts its ability to block UV light—from SPF 5 to 5.5—but even though the sunscreen doesn’t get much stronger, the mice still get far less skin cancer. So something else must be protecting them.

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83%

When mice are exposed to sunlight-like UV rays, adding certain chemicals that neutralize harmful free radicals to sunscreen helps stop skin tumors better—without making the sunscreen block more UV rays. This suggests that these free radicals are a big reason why UV light causes skin cancer.

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83%

Too much sun exposure can seriously harm your skin by damaging cells, aging it faster, weakening your skin’s defenses, and even leading to skin cancer.

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