Why your sunscreen might not be working like it says
Sunscreen Safety and Efficacy for the Prevention of Cutaneous Neoplasm
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Some sunscreens block UV better than others, and how you use them matters a lot — most people don’t put on enough, and sweat washes it away unevenly.
No biological mechanisms were identified in this study. This may be an epidemiological, observational, or survey-based study that reports associations rather than proposing causal biological pathways.
Systematic Reviews & Meta-Analyses
Max 100Randomized Controlled Trials
Max 90Cohort Studies
Max 72Case-Control Studies
Max 58Cross-Sectional Studies
Max 44Case Reports & Case Series
Max 30Expert Opinion & Narrative Reviews
Max 51 / 5
Evidence Score
Based on clinical experience or non-systematic literature reviews. The lowest level of evidence as they are most susceptible to bias and personal perspective.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Some sunscreens block UV better than others, and how you use them matters a lot — most people don’t put on enough, and sweat washes it away unevenly.
No biological mechanisms were identified in this study. This may be an epidemiological, observational, or survey-based study that reports associations rather than proposing causal biological pathways.
Systematic Reviews & Meta-Analyses
Max 100Randomized Controlled Trials
Max 90Cohort Studies
Max 72Case-Control Studies
Max 58Cross-Sectional Studies
Max 44Case Reports & Case Series
Max 30Expert Opinion & Narrative Reviews
Max 51 / 5
Evidence Score
Based on clinical experience or non-systematic literature reviews. The lowest level of evidence as they are most susceptible to bias and personal perspective.
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Claims (4)
Mineral sunscreens with zinc oxide or titanium dioxide sit on top of your skin and don’t get absorbed into your body, making them safer than chemical sunscreens that can enter your bloodstream.
When you put sunscreen on your skin, a chemical called oxybenzone can get into your bloodstream, and some lab and small human studies suggest it might mess with your hormones, affect baby weight depending on whether it's a boy or girl, and harm brain cells in test tubes.
Octocrylene, a common ingredient in sunscreens, doesn’t mess with your hormones, barely gets into your bloodstream, and experts say it’s safe to use in amounts up to 10%.
Sunscreens with titanium dioxide do a better job of matching their labeled sun protection numbers and blocking harmful UVA rays than those with only zinc oxide, so they’re more reliable in real life.