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Glossary2D:4D ratio (second-to-fourth digit ratio)

relative length of index to ring finger

The 2D:4D ratio, also known as the digit ratio, refers to the comparative length of the second digit (index finger) to the fourth digit (ring finger). This ratio is often used as a biomarker for prenatal hormone exposure, with a lower ratio (shorter index finger relative to the ring finger) typically indicating higher exposure to testosterone, and a higher ratio indicating higher exposure to estrogen. This measure has been linked to various biological and behavioral traits, including susceptibility to certain diseases and conditions.

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research Second-To-Fourth Digit Ratio And Seborrheic Dermatitis In Males: A Cross-Sectional Study

5 citations, May 2019 in “Anais Brasileiros de Dermatologia”

Finger length ratios might predict risk for skin condition in males.

research Second to Fourth Digit Ratio in Patients with Hirsutism and Its Correlation with Hormonal Assay

March 2018 in “Benha Journal of Applied Sciences”

Finger length ratio is not linked to hirsutism or hormone levels.

research Second-To-Fourth Digit Ratio and Age Predicting the Severity of Androgenetic Alopecia: A Cross-Sectional Study

December 2022 in “The Aging Male”

Lower 2D:4D ratio and older age increase the risk of severe hair loss in men.

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community 4 month progress. Oral fin and topical min

in Progress Pictures 1414 upvotes 1 week ago

A user shared their 4-month hair regrowth progress using oral finasteride and topical minoxidil, reporting no side effects and positive feedback on their appearance. The post sparked debate, with many users doubting the authenticity of the photos, while others congratulated the user on their impressive results.

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