Does SunScreen Cause Cancer

Interesting reel from Groups asking whether sunscreen causes cancer.

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Short answer

No. The scientific and dermatological consensus is that sunscreen does not cause cancer, and that regular sunscreen use reduces the risk of the three most common skin cancers (basal cell carcinoma, squamous cell carcinoma, and melanoma).<ref>https://www.health.harvard.edu/healthy-aging-and-longevity/the-science-of-sunscreen</ref><ref>https://www.skincancer.org/blog/sunscreen-safety/</ref> The claim that sunscreen causes cancer usually stems from a misreading of the "sunscreen paradox" — the observation that heavy sunscreen users sometimes have higher skin-cancer rates. That correlation is explained by confounding (fair-skinned, sun-seeking people use the most sunscreen) and by sunscreen giving a "false sense of security," not by sunscreen being carcinogenic.<ref>https://www.mcgill.ca/newsroom/channels/news/sunscreen-paradox-mcgill-university-researchers-warn-false-sense-security-352205</ref>

The paper behind the "paradox"

The study frequently cited in these reels is a 2023 UK Biobank analysis from McGill University:

• Jeremian R, Xie P, Fotovati M, Lefrançois P, Litvinov IV. "Gene–Environment Analyses in a UK Biobank Skin Cancer Cohort Identifies Important SNPs in DNA Repair Genes That May Help Prognosticate Disease Risk." Cancer Epidemiology, Biomarkers & Prevention, 2023 Nov 1;32(11):1599–1607. doi:10.1158/1055-9965.EPI-23-0545.<ref>https://aacrjournals.org/cebp/article-abstract/32/11/1599/729740/Gene-Environment-Analyses-in-a-UK-Biobank-Skin</ref><ref>https://www.ukbiobank.ac.uk/publications/gene-environment-analyses-in-a-uk-biobank-skin-cancer-cohort-identifies-important-snps-in-dna-repair-genes-that-may-help-prognosticate-disease-risk/</ref>

The cohort included basal cell carcinoma (n=17,221), cutaneous squamous cell carcinoma (n=2,331), melanoma in situ (n=1,158), invasive melanoma (n=3,798) and healthy controls (n=448,164), surveying 8,798 SNPs across 190 DNA-repair genes. The paper does not conclude that sunscreen causes cancer. Lead author Dr. Ivan Litvinov (Chair of Dermatology, McGill) is emphatic that sunscreen works — the concern is behavioral:

"The problem is that people use sunscreen as a 'permission slip' to tan… This gives them a false sense of security. Sunscreen is important, but it is also the least effective way to protect your skin when compared to sun-protective clothing, rash guards, and sun avoidance."

Why heavy sunscreen users can still show higher cancer rates

• Confounding by risk profile: fair-skinned people who burn easily are both the most likely to use sunscreen and the most genetically susceptible to skin cancer.<ref>https://dermnppa.org/how-to-respond-to-the-sunscreen-paradox/</ref>
• Reverse causation / false sense of security: people apply sunscreen so they can stay outside longer, then under-apply and fail to reapply, accumulating more total UV exposure.<ref>https://www.mcgill.ca/newsroom/channels/news/sunscreen-paradox-mcgill-university-researchers-warn-false-sense-security-352205</ref>
• Historical UVA gap: older sunscreens blocked UVB but were largely transparent to UVA (90–95% of UV energy), so early users were under-protected against melanoma-driving wavelengths.<ref>https://www.medicine.net/news/Worldmedicine/Study-highlights-a-sunscreen-paradox-and-the-false-sense-of-security-against-skin-cancer.html</ref>

Evidence that sunscreen prevents cancer

• Nambour (Green) randomized trial, Australia: 1,621 residents randomized to daily vs. discretionary sunscreen. Daily use halved melanoma incidence over long-term follow-up and cut squamous cell carcinoma by ~60%.<ref>https://ascopubs.org/doi/abs/10.1200/JCO.2010.28.7078</ref><ref>https://www.cancer.org.au/blog/world-leading-research-confirms-regular-sunscreen-use-can-prevent-melanoma</ref>
• A Norwegian study found SPF 15+ sunscreen lowered melanoma risk by ~30%.<ref>https://med.stanford.edu/news/insights/2025/06/sunscreen-science.html</ref>

On sunscreen ingredients

Concerns about ingredients such as oxybenzone being absorbed into the bloodstream have not been shown to cause cancer in humans. Harvard Health notes it "would take an individual 277 years of sunscreen use to achieve the equivalent systemic dose that produced effects in… rat studies," and that mineral-sunscreen nanoparticles "have not been shown to penetrate beyond the level of the skin."<ref>https://www.health.harvard.edu/healthy-aging-and-longevity/the-science-of-sunscreen</ref> The FDA and the Skin Cancer Foundation state there is no direct evidence linking sunscreen ingredients to cancer in humans.<ref>https://www.skincancer.org/blog/sunscreen-safety/</ref>

Bottom line

Sunscreen does not cause cancer; it helps prevent it. But it works best as one layer of protection — combined with shade, sun-protective clothing, and avoiding peak-sun exposure — rather than as a license to stay in the sun longer.

References

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