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GlossaryTelogen Ratio

proportion of hair follicles in the resting phase

The Telogen Ratio refers to the proportion of hair follicles in the telogen phase, which is the resting phase of the hair growth cycle. In a healthy scalp, about 10-15% of hair follicles are typically in this phase. A higher telogen ratio can indicate hair loss conditions such as telogen effluvium, where a larger number of hairs are shed.

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Effects of Platelet-Rich Plasma on Hair Follicle Count and Hair Ratios in Androgenic Alopecia: Alone or Combined with Other Treatments

research Effects of platelet-rich plasma application on hair follicle count, telogen/anagen ratio, and miniaturized hair ratio in patients with androgenic alopecia: alone or in combination with other treatments

July 2025 in “Journal of Dermatological Treatment”

PRP improves hair growth in androgenic alopecia, especially when combined with minoxidil.

The Role of Hair Follicle Counts and Ratios in the Histopathological Assessment of Androgenic Alopecia, Alopecia Areata and Telogen Effluvium: Does Counting 'Count'?

research THE ROLE OF HAIR FOLLICLE COUNTS AND RATIOS IN THE HISTOPATHOLOGICAL ASSESSMENT OF ANDROGENIC ALOPECIA, ALOPECIA AREATA AND TELOGEN EFFLUVIUM: DOES COUNTING ‘COUNT’?

March 2023 in “Human Pathology”

Hair follicle counts and ratios are helpful in diagnosing hair loss types, but should be used with other specific features for accurate diagnosis.

research Evaluation of MCV/RDW Ratio and Correlations with Ferritin in Telogen Effluvium Patients

2 citations , July 2022 in “Dermatology practical & conceptual”

Iron deficiency anemia may contribute to hair loss in women with Telogen effluvium.

A Proprietary Herbal Extract Against Hair Loss in Androgenetic Alopecia and Telogen Effluvium: A Placebo-Controlled, Single-Blind, Clinical-Instrumental Study

research A proprietary herbal extract against hair loss in androgenetic alopecia and telogen effluvium: a placebo-controlled, single-blind, clinical-instrumental study

1 citations , January 2018 in “Acta dermatovenerologica Alpina, Pannonica et Adriatica (Tiskana izd.)”

The herbal extract was found to effectively reduce and prevent hair loss without any side effects.

research Rational evaluation of patients with COVID-19-related hair loss

1 citations , April 2022 in “Revista Da Associacao Medica Brasileira”

COVID-19 can cause different types of hair loss, and proper diagnosis by a specialist may be needed.

The Substantiation of Plant Raw Materials Ratio and Determination of Raw Materials Technological Parameters in the Development of Complex Tincture for the Telogen Effluvium Treatment

research The substantiation of plant raw materials ratio and determination of raw materials technological parameters in the development of complex tincture for the telogen effluvium treatment

January 2015 in “Farmatsevtychnyĭ zhurnal”

The tincture made from nettle, sage, and horse chestnut in a 5:3:2 ratio is effective for treating telogen effluvium.

research The reliability of horizontally sectioned scalp biopsies in the diagnosis of chronic diffuse telogen hair loss in women

137 citations , July 2004 in “Journal of The American Academy of Dermatology”

Horizontally sectioned scalp biopsies are more reliable for diagnosing hair loss in women when three samples are taken instead of one.

Identification of Factors Contributing to Phenotypic Divergence via Quantitative Image Analyses of Autosomal Recessive Woolly Hair/Hypotrichosis with Homozygous c.736T>A LIPH Mutation

research Identification of factors contributing to phenotypic divergence via quantitative image analyses of autosomal recessive woolly hair/hypotrichosis with homozygous c.736T>ALIPHmutation

12 citations , July 2016 in “British journal of dermatology/British journal of dermatology, Supplement”

Different hair fiber development might explain why hair loss severity varies in patients with a specific genetic mutation, and treatments that thicken hair could help.

Evaluation of Biophysical Skin Parameters and Hair Changes in Patients with Acne Vulgaris Treated with Isotretinoin, and the Effect of Biotin Use on These Parameters

research Evaluation of biophysical skin parameters and hair changes in patients with acne vulgaris treated with isotretinoin, and the effect of biotin use on these parameters

5 citations , March 2021 in “International Journal of Dermatology”

Biotin supplementation during isotretinoin treatment for acne may help maintain skin hydration and improve hair growth.

research An analysis of canine hair re‐growth after clipping for a surgical procedure

20 citations , February 2004 in “Veterinary dermatology”

Dog hair grows back in about 14 weeks after being clipped for surgery, and the season doesn't really affect this growth rate.

research The hair root pattern after calcipotriol treatment for scalp psoriasis.

8 citations , September 1995 in “Acta Dermato Venereologica”

Calcipotriol treatment for scalp psoriasis does not cause hair loss.

Prospective Efficacy and Safety Study of an Innovative Kerascalp Hair Growth Serum in Mild-to-Moderate Alopecia in India: Regrowth Study

research Prospective Efficacy and Safety Study of an Innovative Kerascalp Hair Growth Serum in Mild-to-Moderate Alopecia in India: Regrowth Study

May 2023 in “Cureus”

Kerascalp hair serum was found to be safe and effective in improving hair growth and strength in people with mild to moderate hair loss.

research ISID1417 - Interest of a cinchona succirubra extract and its association with caffeine in hair loss

May 2023

Cinchona succirubra extract with caffeine reduces hair loss and strengthens hair.

Evaluation of Hair Growth Promoting Activity of Sansevieria Trifasciata P. on Androgenic Alopecia in Male Rabbits

research Evaluation of Hair Growth Promoting Activity of Sansevieria Trifasciata P. on Alopecia Androgenic Rabbit Male

January 2021 in “International journal of pharmaceutical research”

Sansevieria trifasciata P. extracts, especially the ethyl acetate fraction, effectively promote hair growth in male rabbits with hair loss.

research Interest of an anti–hair loss shampoo supplement used alone and in association with the reference treatment in the management of hair loss

August 2019 in “Journal of the American Academy of Dermatology”

The shampoo helps reduce hair loss and improves Minoxidil® absorption.

research Telogen effluvium on the unilateral flank with testicular tumor in a dog

January 2019 in “Jui rinsho hifuka”

A dog's hair loss was caused by a hormone-secreting testicular tumor.

research Growth and viability of Liaoning Cashmere goat hair follicles during the annual hair follicle cycle

10 citations , January 2014 in “Genetics and Molecular Research”

Liaoning Cashmere goat hair follicles show synchronized growth patterns with lowest activity in May.

research Postpartum telogen effluvium

7 citations , January 2015 in “Journal of the European Academy of Dermatology and Venereology”

Only about 20% of women have hair loss after childbirth severe enough to be considered clinically significant.

research Clinicopathological insights into the phenotypic variation of autosomal recessive hypotrichosis/wooly hair by c.736T>A LIPH mutation

September 2016 in “Journal of dermatological science”

The conclusion is that the variation in hair thinness in patients is mostly due to the amount of underdeveloped hairs, and treatments that thicken fine hairs might work for those with mild to severe conditions.

research Is TrichoScan a new diagnostic method for diffuse hair loss?

2 citations , January 2014 in “Turkish Journal of Medical Sciences”

TrichoScan effectively diagnoses different types of hair loss and is linked to low iron stores in patients.

Evaluation of a Combination of Cystine, B Vitamins and Minerals in the Management of Diffuse Hair Loss in Women: A Prospective, Open-Label Study

research Evaluation of a Combination of Cystine, B Vitamins and Minerals, in the Management of Diffuse Hair Loss in Women: A Prospective, Open-Label Study

May 2026 in “Preprints.org”

The nutrient combination improved hair condition and was safe for women with diffuse hair loss.

research Finasteride increases anagen hair in men with androgenetic alopecia

129 citations , October 2000 in “British Journal of Dermatology”

Finasteride helps increase hair growth in men with hair loss.

Promotion of Anagen, Increased Hair Density, and Reduction of Hair Fall in a Clinical Setting Following Identification of FGF5-Inhibiting Compounds via a Novel 2-Stage Process

research Promotion of anagen, increased hair density and reduction of hair fall in a clinical setting following identification of FGF5-inhibiting compounds via a novel 2-stage process

27 citations , February 2017 in “Clinical, Cosmetic and Investigational Dermatology”

New compounds were found to help increase hair growth and decrease hair loss.

Evaluation of the Relationship of Digital Phototrichogram Findings with Blood TSH, Ferritin, and Vitamin B12 Levels in Patients with Diffuse Hair Loss

research Evaluation of the relationship of digital phototrichogram findings of patients with diffuse hair loss with blood TSH, ferritin and vitamin B12 levels

January 2024 in “İstanbul Kuzey Klinikleri”

Low ferritin levels are linked to increased hair loss; no link found between vitamin B12, TSH levels, and hair loss.

Lonely Hair Sign: Not Specific for Frontal Fibrosing Alopecia

research 570 Targeting JAK/STAT and Wnt/b-catenin pathways and 5a-reductase activity to develop an effective anti-hair loss product

November 2022 in “Journal of Investigative Dermatology”

The lotion with specific plant extracts effectively increased hair growth and improved hair cycle in subjects after 3 months.