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GlossaryAnagen/Telogen Ratio

measure of hair follicles in growth vs. resting phases

The Anagen/Telogen Ratio is a measure used to assess hair growth and health by comparing the number of hair follicles in the anagen (growth) phase to those in the telogen (resting) phase. A higher ratio indicates a greater proportion of actively growing hair, which is typically a sign of healthy hair growth, while a lower ratio may suggest hair loss or a disruption in the hair growth cycle.

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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.

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.

research A stain for plucked anagen hairs

17 citations , August 1979 in “Journal of The American Academy of Dermatology”

A new staining method helps tell growing from resting hairs to diagnose hair loss.

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 Effects of the RV3466F lotion on female telogen effluvium: Results from a 16 week, multi-centric, controlled, randomized trial

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

RV3466F lotion significantly reduces hair loss and improves acute telogen effluvium.

Telogen Effluvium: Causes, Diagnosis, and Treatment

research Telogen effluvium

144 citations , July 2002 in “Clinical and Experimental Dermatology”

Telogen effluvium is a common type of hair loss that can resolve on its own or become chronic, with treatment depending on early diagnosis.

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 A Novel, Drinkable Food Supplement Formulation Reduces Hair Shedding and Increases the Percentage of Anagen Scalp Hair Follicles in Females with Hair Loss

November 2025 in “Journal of Clinical Medicine”

The drinkable supplement reduced hair shedding and increased hair growth in women.

Efficacy and Safety of a Drinkable Nutraceutical in Premenopausal Women with Telogen Effluvium: A 6-Month, Randomized, Multicenter, Double-Blind, Placebo-Controlled Study

research Efficacy and Safety of a Drinkable Nutraceutical in Premenopausal Women with Telogen Effluvium: A 6-Month, Randomized, Multicenter, Double-Blind, Placebo-Controlled Study

November 2025 in “Dermatology and Therapy”

The drinkable supplement increased hair growth and was safe for women with hair loss.

Recovery Effects of Oral Supplementation with Polar Lipid-Rich Wheat Extracts on Acute Telogen Effluvium: A Randomized Double-Blind Placebo-Controlled Study

research Recovery Effects of Oral Supplementation with Polar Lipid-Rich Wheat Extracts on Acute Telogen Effluvium: A Randomized Double-Blind Placebo-Controlled Study

May 2025 in “Clinical Cosmetic and Investigational Dermatology”

Wheat extract supplements reduce hair shedding and improve growth in women with hair loss.

LB1010 Ashwagandha-Derived Exosome-Like Nanoparticles Significantly Promote Human Hair Growth Ex Vivo and In Vivo by Stimulating the Production of the Anagen Promoting Growth Factor VEGF-A

research LB1010 Ashwagandha-derived exosome-like nanoparticles significantly promote human hair growth ex vivo and in vivo by stimulating the production of the anagen promoting growth factor VEGF-A

July 2024 in “Journal of Investigative Dermatology”

Ashwagandha nanoparticles help hair grow by increasing a growth factor.

research Fluridil, a Rationally Designed Topical Agent for Androgenetic Alopecia

August 2002 in “Dermatologic Surgery”

Fluridil safely promotes hair growth in men with androgenetic alopecia.

research Amaranthus Extract Promotes Healthy Follicles and Anagen Hair Density-A Randomized Placebo-Controlled, Double-Blinded Study.

October 2025 in “PubMed”

Amaranthus extract cream safely boosts hair growth in men with hair loss.

research A practical guide for the treatment of dandruff and seborrheic dermatitis

5 citations , March 2004 in “Journal of The American Academy of Dermatology”

Patients with systemic lupus erythematosus and hair loss had non-scarring alopecia with fewer hair follicles, and direct immunofluorescence did not help identify lupus.

research Experimental models to investigate the efficacy and bioequivalence of low dose topical corticoids

March 2004 in “Journal of The American Academy of Dermatology”

Patients with systemic lupus erythematosus and hair loss had fewer hair follicles and non-scarring alopecia; direct immunofluorescence was not helpful in diagnosing lupus in these cases.

research Utility of Horizontal Sections of Scalp Biopsies in Differentiating between Androgenetic Alopecia and Alopecia Areata

3 citations , January 2018 in “Dermatology”

Scalp biopsies help tell apart androgenetic alopecia and alopecia areata.

research A case of imiquimod-induced alopecia

7 citations , February 2010 in “Journal of Dermatological Treatment”

Imiquimod cream can rarely cause temporary hair loss.

research Approach to the adult female patient with diffuse nonscarring alopecia

67 citations , November 2002 in “Journal of The American Academy of Dermatology”

The document concludes that careful evaluation is key to diagnose and treat women with hair loss, with tests for thyroid, iron, and hormones as needed.

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.

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.

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.

research TrichoScan as a method to determine hair root pattern in patients with scalp psoriasis.

6 citations , January 2010 in “PubMed”

Scalp psoriasis is linked to impaired hair growth with more hair in the resting phase.

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 Histopathologic Evaluation of Alopecias

90 citations , June 2006 in “The American Journal of Dermatopathology”

The document concludes that accurate diagnosis of different types of hair loss requires careful examination of hair and scalp tissue, considering both clinical and microscopic features.

Is TrichoScan a New Diagnostic Method for Diffuse Hair Loss?

research Hair loss.

5 citations , October 1984 in “The BMJ”

Up to 50% of scalp hair can be lost before it appears thin, and treatment is only needed for hair loss caused by diseases or deficiencies.