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Glossary Estrogenic Activity

ability of a substance to mimic or influence estrogen effects

Estrogenic activity refers to the ability of a substance to mimic or influence the effects of estrogen, a primary female sex hormone, in the body. This can impact various biological processes, including reproductive health, bone density, and hair growth. Substances with estrogenic activity can bind to estrogen receptors and trigger similar responses as natural estrogen, which is why they are significant in both medical treatments and environmental health studies.

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Research

5 / 1000+ results

research Hormonal activity in commonly used Black hair care products: evaluating hormone disruption as a plausible contribution to health disparities

25 citations , May 2021 in “Journal of exposure science & environmental epidemiology/Journal of exposure science and environmental epidemiology”

This study found that hair products commonly used by Black women exhibited hormonal activity, which could impact health outcomes and contribute to health disparities.

research A Phytochemical and Pharmacological Review on Cynomorium songaricum as Functional and Medicinal Food

2 citations , April 2018 in “Natural Product Communications”

This review summarizes the bioactive compounds and pharmacological functions of Cynomorium songaricum Rupr., emphasizing its potential in developing health-related products, and notes that further research is needed.

research Melatonin and the hair follicle

109 citations , October 2007 in “Journal of pineal research”

This study suggests that melatonin plays a role in hair follicle function by modulating growth and pigmentation, and it may act as a protective agent in active hair growth phases.

research Sex Hormone-Binding Globulin (SHBG) as an Early Biomarker and Therapeutic Target in Polycystic Ovary Syndrome

58 citations , November 2020 in “International Journal of Molecular Sciences”

This review discusses the relationship between SHBG, NAFLD, and PCOS and reports no new clinical results; the authors highlight low hepatic SHBG production as potentially significant in PCOS pathogenesis.

research Reproduction of the human relevant potency threshold (HRPT) for estrogen receptor alpha agonism in an inference performance screen for ICCVAM’s regulatory scientific confidence framework

October 2025 in “Frontiers in Toxicology”

This study found that a human relevant potency threshold for estrogen receptor alpha agonism may serve as a health-protective screening tool, and highlights inference performance as essential for scientific confidence frameworks.

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Community Join

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community 20MTF Results on the crown from 1 year on estrogen injections

468 upvotes 6 months ago

Estrogen injections significantly improved hair growth, particularly on the crown, after stopping finasteride. Monotherapy with estrogen led to hairline improvement, but also caused sterility and potential feminization effects.

community Injecting estrogen for hairline regrow

268 upvotes 1 year ago

A user plans to undergo a temporary MtF transformation to regrow hair, using estrogen, RU58841, and Dutasteride, then revert with testosterone. Many users criticize the plan, suggesting alternatives like hair transplants, and emphasize that estrogen is not a reliable solution for hair regrowth.

community High estrogen on finasteride, thoughts?

37 upvotes 1 month ago

A 29-year-old male has been using finasteride for hair regrowth but is experiencing side effects like low libido and emotional changes, possibly due to high estrogen levels. Suggestions include weight loss, consulting an endocrinologist, switching to topical treatments, or trying dutasteride.

community Does having low estrogen make one a better candidate for finasteride?

8 months ago

Low estrogen levels may reduce the risk of side effects from finasteride, such as gynecomastia. Some users plan to start with microneedling and minoxidil before trying finasteride, while others have experienced temporary side effects from topical finasteride but continued use without persistent issues.

community How insane would it be to take estrogen until all your hair grows back, then getting off of it and taking fin or dut to maintain

in Chat 69 upvotes 9 months ago

Using estrogen for hair regrowth is considered ineffective and risky, with potential side effects like breast growth and hormonal changes. Alternatives like finasteride, dutasteride, and minoxidil are suggested, but estrogen is not recommended unless transitioning.

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Learn

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learn Alfatradiol

Alfatradiol: What does a form of estrogen have to do with hair loss in men? Alfatradiol (17α-estradiol) is a topical hormone sold without prescription in German pharmacies, licensed there for mild androgenetic alopecia, and not FDA-approved. The controlled trial evidence is in women, where hair density and thickness stayed nearly unchanged over 6 months while minoxidil improved them (the trial had no placebo group); no comparable placebo-controlled trial in men appears to have been published.

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