The Claim

Transgender women athletes achieve female-typical testosterone concentrations (1.10 ± 0.52 nmol/L) after an average of 5 months of gender-affirming hormone therapy, with significant reductions from pre-therapy levels (18.4 ± 2.8 nmol/L), indicating effective suppression of endogenous androgen production.

Source: Longitudinal Performance Changes in Transgender Women Athletes Pre and Post Gender Affirming Hormone Therapy

What the research says

Supports is higher

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

Supports
44score
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

Trans women athletes on hormone therapy see their testosterone drop to typical female levels after about 5 months, which shows the treatment is working to lower male hormone levels.

See the scientific wording

Transgender women athletes exhibit female-typical testosterone concentrations (1.10 ± 0.52 nmol/L) after an average of 5 months of gender-affirming hormone therapy, with significant reductions from pre-therapy levels (18.4 ± 2.8 nmol/L), indicating effective suppression of endogenous androgen production.

What the research says

1 study
  1. Study: Longitudinal Performance Changes in Transgender Women Athletes Pre and Post Gender Affirming Hormone Therapy

    The study shows that transgender women on hormone therapy have testosterone levels similar to cisgender women, just like the claim says, so it supports it.

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

Fit Body Science verdict — we translate health claims into clear verdicts backed by peer-reviewed research.

Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.