Story perspectives

Study Reveals Progesterone Boosts Breast Growth in Trans Women

9/7/2025

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Summary

Story summary

A study by Amsterdam UMC found that progesterone enhances breast growth in transgender women undergoing hormone therapy.
Over three years, 90 participants underwent 3D scanning to measure breast volume.
Participants saw up to a 37% increase in volume and reported greater satisfaction with breast size.
The most growth occurred with increased oestradiol dosage.
Side effects included fatigue and tenderness, but no severe events were reported.
Future research will focus on long-term safety and optimal progesterone dosing.

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Story summary

A study by Amsterdam UMC found that progesterone enhances breast growth in transgender women undergoing hormone therapy.
Over three years, 90 participants underwent 3D scanning to measure breast volume.
Participants saw up to a 37% increase in volume and reported greater satisfaction with breast size.
The most growth occurred with increased oestradiol dosage.
Side effects included fatigue and tenderness, but no severe events were reported.
Future research will focus on long-term safety and optimal progesterone dosing.