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Thyroid Hormones Directly Alter Human Hair Follicle Functions: Anagen Prolongation and Stimulation of Both Hair Matrix Keratinocyte Proliferation and Hair Pigmentation

research Thyroid Hormones Directly Alter Human Hair Follicle Functions: Anagen Prolongation and Stimulation of Both Hair Matrix Keratinocyte Proliferation and Hair Pigmentation

115 citations , August 2008 in “The Journal of Clinical Endocrinology & Metabolism”

In this study, T3 and T4 were found to directly influence human hair follicles in vitro, enhancing keratinocyte proliferation, prolonging the hair growth phase, and affecting pigmentation.

research Prevention of chemotherapy drug-mediated human hair follicle damage: combined use of cooling with antioxidant suppresses oxidative stress and prevents matrix keratinocyte cytotoxicity

4 citations , July 2025 in “Frontiers in Pharmacology”

This study found that cooling combined with antioxidants can improve scalp cooling effectiveness in preventing chemotherapy-induced alopecia by maintaining hair follicle viability and function.

Characterization of Cell Cycle Arrest and Terminal Differentiation in a Maximally Proliferative Human Epithelial Tissue: Lessons from the Human Hair Follicle Matrix

research Characterisation of cell cycle arrest and terminal differentiation in a maximally proliferative human epithelial tissue: Lessons from the human hair follicle matrix

30 citations , April 2017 in “European Journal of Cell Biology”

This study observed that CIP/KIP proteins play a significant role in regulating cell cycle arrest and differentiation in human hair follicles, supporting hair growth and formation in the anagen phase.

research 1432 IL-9/IL-9R signaling as a novel regulator of human hair follicle growth and immune privilege

April 2023 in “Journal of Investigative Dermatology”

In ex vivo organ culture of human scalp hair follicles, this study found that IL-9 signaling inhibits hair growth, reduces progenitor cell generation, and disrupts immune privilege.

research 650 Controlling mTORC1 activity as a novel therapeutic strategy for managing human hair growth and pigmentation

July 2022 in “The journal of investigative dermatology/Journal of investigative dermatology”

This study found that inhibiting mTORC1 activity with rapamycin significantly increased melanin production and extended hair growth phase in human hair follicles, suggesting potential for managing hair growth and pigmentation disorders.

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community Weed/THC effects on hair growth/hair loss, and vitality of organ-culture human follicle studies (research review)

4 upvotes 1 year ago

Cannabis and THC may have mixed effects on hair, with some studies suggesting potential negative impacts on hair growth in isolated hair follicles, but these results are hard to apply to living humans. Treatments like minoxidil and finasteride are commonly used for hair loss, and the effects of cannabis might be neutral or vary based on individual factors.

community Sugars ARE important for hair growth | Glycosaminoglycans as Hair Growth Stimulant

74 upvotes 2 years ago

Glycosaminoglycans are important for hair growth, and combining minoxidil with tretinoin and Biopeptide-CL may enhance hair growth by boosting glycosaminoglycan levels and improving the hair follicle environment. Users discussed the potential effectiveness and future of these treatments.

community Someone please offer reassurance

in Minoxidil 3 upvotes 1 month ago

A 19-year-old male is experiencing hair shedding while using oral minoxidil, ketoconazole, dermastamping, and saw palmetto, and is considering switching to finasteride for better results. Users suggest that saw palmetto may not be effective and recommend finasteride instead, while also discussing other treatments like rosemary oil, peppermint oil, and pumpkin seed oil.

community Sandalore experiment

18 upvotes 7 years ago

A user added sandalore to minoxidil for hair loss, observing some vellus hair growth and less scalp inflammation. Others tried sandalore with mixed results, discussing dosage and effectiveness compared to minoxidil and finasteride.

community Prevention of age-related beard graying in humans by the topical application of Eriodictyon angustifolium extract

5 upvotes 4 years ago

Topical application of Eriodictyon angustifolium extract can prevent and reverse age-related beard graying and darken gray hair by increasing melanin production. Sterubin, a component of the extract, also promotes hair pigmentation and protects cells from DNA damage.

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learn Osteopontin

signaling protein that, when suppressed, may grow hair by reducing inflammation and stem cell loss

learn Thymosin Beta 4

learn Stem Cell Factor

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SMP Specialist
Hairo Fallas
Newark, NJ, United States

Hairo Fallas