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Glossary Hair Shaft Alterations

changes in hair's structure affecting thickness, texture, or strength

Hair Shaft Alterations refer to changes or abnormalities in the structure of the hair shaft, which is the visible part of the hair that extends above the scalp. These alterations can include variations in thickness, texture, strength, and overall appearance, and can be caused by genetic factors, environmental damage, or underlying health conditions. For professionals, understanding these alterations is crucial for diagnosing hair disorders and recommending appropriate treatments.

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Research

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research Alterations in Hair Follicle Morphology and Hair Shaft Production After Follicular Unit Transplantation

8 citations , February 2016 in “The American Journal of Dermatopathology”

In this study, the researchers found that transplanted hair follicles undergo significant morphological changes, including a thickened dermal sheath and increased hair shaft diameter, which are associated with altered follicular vascularization.

research Adverse reaction to isotretinoin: alteration of the hair shaft structure

January 2022 in “Surgical & Cosmetic Dermatology”

This case report described a rare instance of new curly hair growth in a patient undergoing isotretinoin treatment for acne vulgaris, highlighting the potential for isotretinoin to alter hair fiber curvature.

research Hair cosmetic alterations

September 1998 in “JEADV. Journal of the European Academy of Dermatology and Venereology/Journal of the European Academy of Dermatology and Venereology”

The document concludes that individualized treatments for hair issues are effective, certain hair changes can indicate neurocutaneous diseases, specific lotions improve skin health, laser hair removal works but needs more study on long-term effects, men's cosmetics are diverse, peeling is effective but can have side effects, and facial pigmentation is often due to overactive skin cells.

research Hair abnormalities and neurological disease

September 1998 in “JEADV. Journal of the European Academy of Dermatology and Venereology/Journal of the European Academy of Dermatology and Venereology”

Hair changes could indicate neurological diseases and help monitor treatment.

research Image 2_Alteration of hair growth in mice by circulating exosomes from Xinji fine-wool and small-tailed Han sheep.png

April 2025 in “OPAL (Open@LaTrobe) (La Trobe University)”

In this study, researchers found that circulating exosomes isolated from the plasma of Xinji fine-wool and small-tailed Han sheep influenced hair growth characteristics in mice, altering follicle and hair shaft diameters, and affecting hair follicle development and melanin synthesis.

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Community Join

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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.

community Reminder: NURTURE those dormant hair follicles for as long as you can until PP405 comes out in 2028-2030

in Treatment 191 upvotes 10 months ago

PP405 is anticipated as a future treatment for dormant hair follicles, but its effectiveness and safety are uncertain. Current treatments include oral minoxidil and microneedling, with some avoiding finasteride due to side effects.

community Results are in for my experiment with Creatine/Fin

129 upvotes 6 years ago

Creatine use with finasteride increased DHT levels, possibly affecting hair loss. The user plans to reduce creatine to stabilize DHT and hair shedding.

community DHT Harms Scalp Microbiome: DHT Itch is REAL

413 upvotes 1 year ago

Increased Malassezia and Cutibacterium in the scalp microbiome are linked to higher sebum production and inflammation in androgenetic alopecia (AGA). Treatments include ciclopirox shampoo, benzoyl peroxide shampoo, clobetasol propionate, calcipotriol, minoxidil, finasteride, and dutasteride.

community Hair Shaft Diameter and Density Comparison

13 upvotes 1 month ago

The conversation discusses differences in hair shaft diameter and density between thinning and denser areas on the scalp. Treatments mentioned include Minoxidil, finasteride, and dutasteride.

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Learn

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learn oleic acid

Is there a difference between getting Oleic Acid from oils (like olive oil) versus hair products? Oils on the hair act mainly on the hair shaft and skin surface; eating olive oil is linked with heart health in cohort studies. Neither route has been shown to affect hair growth.
How does Oleic Acid support hair follicle strength and growth? Lab and animal studies suggest oleic acid may help the scalp barrier and hair shaft. No human trial shows that it strengthens follicles or slows hair loss.

learn Cetirizine

How does cetirizine reduce inflammation linked to hair loss? Cetirizine is proposed to lower prostaglandin D2 and raise prostaglandin E2 around hair follicles; three small trials of a compounded 1% topical report modest increases in hair density and shaft thickness, with minoxidil doing better head-to-head. Topical cetirizine is off-label and unapproved for hair loss, and the evidence is too thin to call it effective or safe.

learn Hair Multiplication

extract, clone, and reinsert your own hair cells

learn Castor oil

Thick plant oil used in hair care

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Clinics

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Hair TransplantHair Loss TreatmentsSMP
SHIFT Hair TRİstanbul · TR

Experts

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SMP Specialist
Hairo Fallas
Newark, NJ, United States

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Hairo Fallas