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Glossary Hair Diameter

width of an individual hair strand, measured in micrometers

Hair Diameter, also known as hair shaft diameter or hair thickness, refers to the width of an individual strand of hair. It is typically measured in micrometers (µm) and can vary significantly among individuals and even among different hairs on the same person. This measurement is important for understanding hair texture, strength, and overall health, and it can influence how hair responds to styling and treatment products.

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Research

5 / 1000+ results

research The Development and Application of the Hair Diameter Index (HDI)

3 citations , January 2021 in “Hair transplant forum international”

This study found that visual hair density is better correlated with hair count and shaft diameter, leading to the development of the Hair Diameter Index used in planning hair restoration procedures.

research Investigation of oral finasteride enhanced occipital hair diameter index in different types of male androgenetic alopecia

August 2023 in “Journal of The American Academy of Dermatology”

Recent studies highlighted in this research suggest that alopecia types in men, traditionally thought to affect only certain scalp areas, can also impact the occipital region, which was previously presumed unaffected.

research Several variants on chromosome 10 are associated with coarse hair diameter in Dazu black goats (Capra hircus)

3 citations , January 2025 in “Animal Genetics”

In this study, researchers conducting a genome-wide association study on 263 adult female goats identified significant genomic variants linked to coarse hair diameter, particularly emphasizing a crucial region on Chromosome 10. These findings enhance understanding of the genetic factors influencing fiber diameter in goats.

research PRECISE Scale: a quantitative classification for androgenetic alopecia and its application to hair transplantation

June 2023 in “Aesthetic Plastic Surgery”

This study introduces the PRECISE scale, a quantitative tool to classify androgenetic alopecia, aiming to improve planning and outcomes for hair transplantation surgeries by evaluating the whole hairless and thinning areas.

research A new classification of early female pattern hair loss

3 citations , January 2018 in “International Journal of Trichology”

The authors concluded that their new grading system can effectively classify early female pattern hair loss and evaluate treatment progress.

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Community Join

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community Why Fin/Dut Isn't Working for You GPR133: a new hairloss mechanism + Steroid Hair Loss Deep Dive

6 upvotes 1 month ago

Hair loss may be linked to the GPR133 receptor, independent of the androgen receptor pathway. Treatments like finasteride, dutasteride, minoxidil, RU58841, and KX-826 show varying results, with hair loss persisting due to high testosterone and GPR133's role.

community Why do Minoxidil gains need continued Minoxidil to be kept and can´t be retained with DHT blockers?

in Chat 66 upvotes 9 months ago

Minoxidil and finasteride work through different mechanisms; minoxidil-dependent hair requires continued use to maintain growth, while finasteride prevents further hair loss but cannot sustain minoxidil gains alone. Current treatments like minoxidil, finasteride, and others need indefinite use, as no permanent solution exists yet.

community I Recovered From Severe Hair Loss: My 8-Month Regrowth Recovery — Full Timeline, Photos & Treatment Data

35 upvotes 4 months ago

A 29-year-old male experienced significant hair regrowth over 8 months using a protocol of oral Minoxidil, Dutasteride, Pyrithione Zinc Shampoo, and peptides GHK-CU, BPC-157, and TB-500. The treatment led to improved scalp coverage, reduced hair loss, and thicker hair, although results may vary for others.

community Solving Hair Loss with Research at MIT

in Research/Science 595 upvotes 1 year ago

Hair loss treatments like minoxidil, finasteride, TDM-105795, and PP405. MIT is hosting a hackathon to find innovative hair loss solutions.

community Prolactin the Cause of Hair Loss? ABS-201 the Cure?

29 upvotes 2 months ago

Prolactin may contribute to hair loss, but targeting its receptor won't cure androgenetic alopecia. ABS-201 could be a useful alternative or adjuvant therapy, similar to JAK inhibitors, but not more effective than HMI-115.

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Learn

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learn Thymosin Beta 4

learn Finasteride

Does hair strand thickness decrease in men with androgenic alopecia? Can finasteride help restore it? Androgenic alopecia thins hair strands by miniaturizing follicles. The pivotal finasteride trials (1,553 men, 1 mg/day, two years) report increased hair counts and improved assessed appearance, but they measured density, not the diameter of individual strands, so the effect on thickness itself is not established.

learn Fluridil

Can daily Fluridil application stop hair follicle miniaturization? The single published fluridil trial (43 men, 9 months, double-blind and placebo-controlled) reported more hairs in the growth phase, but it never measured follicle diameter and has not been replicated — so whether daily use stops miniaturization is unproven, and community users describe stabilization rather than regrowth.

learn Exosomes

Microscopic delivery system that sends growth-promoting signals to hair follicles

learn Caffeine

the stimulant you know and love can be used topically to stimulate hair

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