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Do you have any reason to believe the same chemicals are exclusively in tears (vs feces, urine, sweat, saliva, etc)? Also, it should be easy to do an order-of-magnitude estimate of the effect, even if a chemical is exclusively in tears (concentration * volume). It's highly implausible tears contain anywhere near enough of a particular hormone to affect concentrations across a volume as large as a human body, and deserves some scrutiny/evidence.

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