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the claim

Human menstrual cycles synchronize through social or pheromonal interaction

the verdict
REFUTED
the evidence says no
Recorded sources
1 source for · 2 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that human menstrual cycles synchronize through social or pheromonal interaction?

No. Although some older observational studies reported evidence of menstrual synchrony, modern methodological evaluations and rigorous reviews have debunked human pheromones and chemical synchronization claims as lacking robust scientific backing.

Verdict: REFUTED · 1 source for, 2 against · Last checked

The analysis

Judged against the evidence record for claims of this kind.

Evidence for · 1
Environmental influences cause menstrual synchrony, not pheromones
1989
An older study observed menstrual synchrony among women living in close quarters and attributed it to environmental influences.
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Little, B. B., Guzick, D. S., Malina, R. M., & Ferreina, M. D. R. (1989). Environmental influences cause menstrual synchrony, not pheromones. peer-reviewed literature. https://doi.org/10.1002/ajhb.1310010110

Evidence against · 2
The search for human pheromones: the lost decades and the necessity of returning to first principles.
2015
Reviews the history of human pheromone research and concludes there is no robust bioassay-led evidence for widely published claims about human pheromones.
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TD, W. (2015). The search for human pheromones: the lost decades and the necessity of returning to first principles.. peer-reviewed literature. https://doi.org/10.1098/rspb.2014.2994

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More against · 1
Reproducible research into human chemical communication by cues and pheromones: learning from psychology's renaissance.
2020
Notes that putative human chemical communication studies suffer from the reproducibility crisis and methodological flaws.
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TD, W. (2020). Reproducible research into human chemical communication by cues and pheromones: learning from psychology's renaissance.. peer-reviewed literature. https://doi.org/10.1098/rstb.2019.0262

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What does the evidence say?

Judged against the evidence record for claims of this kind.

Receipt History
first checked05 Aug 2026
judged → REFUTED · 2405 Aug 2026
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