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Glossary Hormone Signaling

chemical messengers travel through blood to regulate body functions

Hormone signaling, also known as endocrine signaling, is a process where hormones, which are chemical messengers produced by glands, travel through the bloodstream to target organs or cells. These hormones bind to specific receptors on or inside the target cells, triggering a response that regulates various physiological activities such as growth, metabolism, and reproduction.

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Research

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research Arabidopsis ADF8 and ADF11 contribute to root hair growth to respond to hormone and environmental signals

February 2026 in “The Plant Journal”

This study found that in Arabidopsis, root hair-specific proteins ADF8 and ADF11 are crucial for responding to hormonal signals like auxin and ethylene, which in turn modulate actin filament dynamics and are key for root hair growth under various environmental conditions.

research 562 Neuroendocrinology of human scalp hair follicles: Growth hormone-releasing hormone (GHRH) stimulates hair growth and controls a fully functional intrafollicular hypothalamic-pituitary-somatotropic (HPS) signaling axis

November 2022 in “Journal of Investigative Dermatology”

This study found that human scalp hair follicles produce neurohormones and responded to GHRH stimulation by prolonging hair growth, suggesting a functional peripheral HPS neuroendocrine signaling axis in the skin.

research Hormone-induced aberrations in electromagnetic adhesion signaling as a developmental factor of androgenetic alopecia

4 citations , April 2002 in “Medical Hypotheses”

Hormones cause hair loss by affecting cell growth and weakening cell attraction.

research [G-proteins, receptor signal transduction, and growth hormone secretion].

March 1993 in “PubMed”

This review discusses the clinical forms and causes of androgenization in women, as well as therapeutic options, reporting success with antiandrogens like cyproterone acetate and spironolactone for skin symptoms, though results are not permanent.

research Intrinsic factors in the pathogenesis of hidradenitis suppurativa: Genetics, hormones, and the microbiome

7 citations , November 2024 in “Journal of the American Academy of Dermatology”

Genetics, hormones, and microbiome changes contribute to hidradenitis suppurativa.

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Community Join

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community A stress hormone has been found to signal through skin cells to repress the activation of hair-follicle stem cells in mice

30 upvotes 5 years ago

Stress can lead to hair loss by affecting hair-follicle stem cells, and this loss is harder to recover from if one has male pattern baldness (MPB). Treatments like finasteride and minoxidil are used to address hair loss, but stress-related hair loss differs from androgenic alopecia.

community Why does the same hormone grow your beard and destroy your hairline?

44 upvotes 4 months ago

DHT promotes beard growth but causes scalp hair loss due to inflammation and fibrosis. Treatments like finasteride and minoxidil help with hormonal signals and blood flow but don't address underlying inflammation.

community Dht is a real bastard of a hormone it’s annoying to get rid of it

335 upvotes 3 days ago

DHT affects hair loss and hormonal balance, with treatments like finasteride, dutasteride, and minoxidil being discussed. Users share experiences with side effects, gym performance, and the impact on libido, with some suggesting complex treatment regimens.

community Finasteride - impact on Neurosteroids, which yes, \are important and not a garbage hormone

in Research/Science 163 upvotes 1 year ago

Finasteride may affect neurosteroids, impacting mood and sexual function, with varied user experiences. Some report side effects like depression and sexual dysfunction, while others find it effective for hair retention or prefer alternatives like Dutasteride or topical treatments.

community Mallia Aesthetics achieves key regulatory steps for novel sCD83-derived ingredient for hair growth

24 upvotes 1 year ago

Mallia Aesthetics has developed MAL-838, a hormone-free product derived from sCD83, which stimulates hair growth without disrupting the skin microbiome. sCD83 promotes hair growth by activating hair follicles and preventing cell death, offering a localized treatment without systemic side effects.

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Learn

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learn Follistatin

Is follistatin safe for use in women or transgender individuals undergoing hormone therapy? No study has tested follistatin in women or transgender people on hormone therapy, and it has no approved human use or established dose; the one relevant signal, from a 2023 randomized study in adolescents with PCOS, links higher follistatin to less favourable metabolic markers, so the published evidence does not support using it in this group.

learn sh-Polypeptide-7

Does sh-Polypeptide-7 stimulate hair follicles or reduce scalp inflammation? sh-Polypeptide-7 is the INCI name for a lab-made form of human growth hormone (somatotropin) — not EGF, which is sh-Oligopeptide-1. Growth hormone and IGF-1 signalling is documented in hair follicle biology, but there is no published human trial of sh-Polypeptide-7 applied to the scalp for hair growth or scalp inflammation.

learn Stemoxydine

Cosmetic ingredient made by L'Oréal

learn Clascoterone

Topical androgen-receptor blocker, approved as an acne cream

learn Neem Oil

Oil from the neem tree, used in traditional remedies

learn Centella

Hormone-related scalp sensitivity: is there evidence for a centella mask? Centella asiatica has anti-inflammatory and wound-healing effects in animal and cell studies, but no published research has tested a centella scalp mask on the human scalp, in hormonal contexts or otherwise, and no community reports were found of one being used this way.

learn procapil

Does Procapil block DHT without affecting hormones? What the evidence shows Procapil's supplier describes it as inhibiting 5-alpha reductase at the scalp without changing hormone levels, but the published support is cell and animal work plus one small human study of a caffeine-plus-Procapil formula. It is a cosmetic ingredient, not an approved hair-loss treatment, and no trial has compared it with finasteride or minoxidil.

learn Estradiol

Why is Estradiol used to treat hair loss in women and transgender people undergoing hormone therapy? Estradiol is used within supervised hormone therapy and may slow hormone-related hair loss in some women and trans women, but the evidence is limited and it carries serious whole-body risks.

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