The Claim

Dermal application of a commercial sunscreen containing octocrylene and avobenzone results in measurable systemic absorption of these UV filters and their metabolites in humans, with plasma concentrations reaching up to 25 μg/L for octocrylene, 11 μg/L for avobenzone, and 1352 μg/L for the metabolite CDAA after a single day of real-life use.

Source: Systemic availability of lipophilic organic UV filters through dermal sunscreen exposure.

What the research says

Supports is higher

Support is ahead, but a single strong opposing study can change this.

Supports
25score
Challenges
0score

These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.

Quantitative
1 study reviewed
In plain English

When people apply sunscreen containing octocrylene and avobenzone to their skin, these chemicals and one of their breakdown products enter the bloodstream at measurable levels within one day of normal use.

See the scientific wording

Dermal application of a commercial sunscreen containing octocrylene and avobenzone leads to measurable systemic absorption of these UV filters and their metabolites in humans, with plasma concentrations reaching up to 25 μg/L for octocrylene, 11 μg/L for avobenzone, and 1352 μg/L for the metabolite CDAA, indicating significant bioavailability after a single day of real-life use.

Why this might work

Sunscreen chemicals dissolve into the outer layer of the skin, enter the bloodstream, and some are broken down into new compounds. These compounds build up in the body because they leave slowly, and the body eventually removes them through urine.

Verified mechanismbased on 1 study

What the research says

1 study

  1. Study: Systemic availability of lipophilic organic UV filters through dermal sunscreen exposure.

    When people use sunscreen as directed, chemicals like octocrylene and avobenzone get absorbed into the bloodstream, and the body turns some of them into other compounds — one of those, CDAA, builds up even more. This study proved it happens in real life, not just in labs.

Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies

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