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the claim

Human menstrual cycles synchronize through social or pheromonal interaction

the verdict

REFUTED

the evidence says no

refutedsupported

the weight of evidence

1 source for · 2 against

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.

Evidence for · 1

Environmental influences cause menstrual synchrony, not pheromones

1989 · cited by 22

An older study observed menstrual synchrony among women living in close quarters and attributed it to environmental influences.

Evidence against · 2

The search for human pheromones: the lost decades and the necessity of returning to first principles.

2015 · cited by 59

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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The analysis

Judged against the evidence record for claims of this kind.

More against · 1

Reproducible research into human chemical communication by cues and pheromones: learning from psychology's renaissance.

2020 · cited by 21

Notes that putative human chemical communication studies suffer from the reproducibility crisis and methodological flaws.

Everything we examined (3)

Environmental influences cause menstrual synchrony, not pheromonespeer-reviewedsupports
The search for human pheromones: the lost decades and the necessity of returning to first principles.peer-reviewedrefutes
Reproducible research into human chemical communication by cues and pheromones: learning from psychology's renaissance.peer-reviewedrefutes

The paper trail · every fact has a biography

first checked05 Aug 2026

judged → REFUTED · 2405 Aug 2026

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