Avobenzone in sunscreen causes cancer
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Evaluation of cytotoxic and genotoxic potential of avobenzone and octocrylene on human skin fibroblast cells
Published 2023Reviewer Insight8/28/2026This study found that avobenzone caused DNA damage and increased oxidative stress in human skin cells grown in a laboratory dish, with greater damage when combined with octocrylene. These findings are concerning as biological signals, but they do not show that avobenzone causes cancer.
- The experiment used cells in a dish, not people: results in isolated cells do not automatically apply to the human body
- The study measured DNA damage (a precursor signal), not cancer formation: these are different endpoints
- The concentrations used are at or near levels found in sunscreen creams, but whether those concentrations actually reach deep skin cells in real life was not measured
- The authors themselves call for animal and mechanistic studies as necessary next steps before stronger conclusions can be drawn
- No study of cancer outcomes ( in animals or humans ) was conducted
- Invalid
Comprehensive review of avobenzone (butyl methoxydibenzoylmethane) toxicology data and human exposure assessment for personal care products
Published 2025Reviewer Insight8/28/2026This review of existing studies concludes that avobenzone, the main UVA-blocking ingredient in many sunscreens, does not cause cancer and poses no meaningful health risk at levels used in products. The finding that avobenzone is not toxic to DNA, did not promote tumors in animal studies, and actually reduced UV-induced skin tumors in mice directly contradicts the claim that it causes cancer.
- Who funded it matters: The review was paid for by an industry group whose member companies sell avobenzone sunscreens — a significant conflict of interest
- No 2-year cancer study exists: Safety is inferred from shorter animal studies and genetic toxicity tests, not from the gold-standard long-term carcinogenicity bioassay
- Narrative review design: Authors selected and interpreted existing studies rather than running new experiments or applying statistical pooling — this format is not independently verifiable
- In vitro signals were observed but dismissed because real-world blood levels after sunscreen use are far lower than concentrations that produced effects in lab dishes
Snapshot built: 2026-10-27