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Crossfire

Should the FDA finding that sunscreen chemicals reach your bloodstream change which sunscreen you buy?

What the experts say

Darin OlienBA (exercise physiology, kinesiology, nutrition), per his own site; no institution named · author and podcast host

Yes: switch to zinc oxide or titanium dioxide

What it rests onFDA measurements far above its own level of concern after a single application, and higher with repeated use; EWG's reading that elevated blood levels sit alongside evidence of adverse effects

Source: podcasts.happyscribe.com ↗
Michelle WongPhD · chemist and science communicator

No: absorption was already known and detection is not dose

What it rests onAbsorption into blood has been established for a long time; the threshold crossed triggers a data requirement, not a safety verdict; six subjects per sunscreen at roughly double typical application; the study's own authors said the findings do not warrant avoiding these filters; avoiding them can itself cause harm

Source: labmuffin.com ↗

Overview

Wong is describing people in general, under test conditions that use far more sunscreen than most people apply. Olien does not say who he is talking to, and the one group he flags is pregnancy, where the case for caution is strongest and the evidence thinnest.

Where they agree

Both agree the filters are absorbed and both agree sunburn is the thing to avoid. Olien's own stated primary recommendation in the episode is 'Do not burn. That is clear across all research.'

What would settle it

A study relating measured plasma concentrations at real-world application rates to a health outcome, rather than to a regulatory threshold.

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