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GlossarySteroid 5 Alpha-Reductase 2

enzyme converting testosterone to potent androgen dihydrotestosterone (DHT)

Steroid 5 Alpha-Reductase 2 (also known as 5α-Reductase Type 2 or SRD5A2) is an enzyme that converts testosterone into dihydrotestosterone (DHT), a more potent androgen. This enzyme plays a crucial role in the development of male characteristics and is also implicated in conditions like male pattern baldness and benign prostatic hyperplasia.

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research Sex dependent influence of a functional polymorphism in steroid 5‐α‐reductase type 2 (SRD5A2) on post‐traumatic stress symptoms

35 citations , March 2013 in “American Journal of Medical Genetics Part B Neuropsychiatric Genetics”

SRD5A2 gene variations affect PTSD symptoms differently in males and females.

research LY191704: a selective, nonsteroidal inhibitor of human steroid 5 alpha-reductase type 1.

53 citations , June 1993 in “Proceedings of the National Academy of Sciences of the United States of America”

LY191704 is a compound that effectively blocks a specific enzyme involved in hormone conversion and could help treat enlarged prostate and hair loss.

research Fast Motions in 5 Alpha Reductase and Its Impact on Enzyme Kinetics

May 2026 in “ACS Catalysis”

Efficient enzyme function relies on specific residue interactions and structural coordination.

research The 5 Alpha-Reductase Isozyme Family: A Review of Basic Biology and Their Role in Human Diseases

218 citations , December 2011 in “Advances in Urology”

The document concludes that the 5 alpha-reductase enzymes are important in steroid metabolism and related to various human diseases, with inhibitors used to treat conditions like male pattern baldness and prostate issues.

research Human Osteoblast-Like Cells Express Predominantly Steroid 5α-Reductase Type 1

56 citations , December 2002 in “The Journal of Clinical Endocrinology & Metabolism”

Human bone cells mainly produce a type 1 enzyme that may help regulate bone health.

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community 5 alpha reductase type 1 is in brain tissue producing the main endogenous gabaergic allopregnanolone, not 2. How can finasteride as a 5ar2 lower that?

in Finasteride/Dutasteride 30 upvotes 1 year ago

Finasteride and dutasteride are discussed for hair loss, with concerns about their effects on neurosteroids and potential side effects like depression. Alternatives like topical estrogen and lifestyle changes are considered, with varying opinions on mental health and hair regrowth.

community Did anybody use beta sisterol for hair loss? I saw in many articles in the internet that said that beta sisterol blocks dht by inhibiting 5a reductase type 2 enzyme and some reviews of people who said that it worked better than saw palmetto in terms of stoping hair loss and helping prostate.

in Research/Science 9 upvotes 3 years ago

Beta-sitosterol may inhibit 5-alpha reductase type 2 enzyme, potentially reducing DHT levels and promoting hair growth, similar to finasteride but possibly with fewer side effects. Its effectiveness and side effects compared to other treatments like saw palmetto and finasteride remain uncertain due to limited research.

community FCE 28260: A Forgotten 5α-Reductase Inhibitor

in Research 330 upvotes 1 year ago

FCE 28260 (PNU 156765), an under-explored 5α-reductase inhibitor, showcases promising results in research by Giudici et al., outperforming well-known treatments like Finasteride in reducing the conversion of testosterone to DHT. Its superior efficacy, demonstrated through lower IC50 values in both natural and human recombinant enzyme studies, suggests it could offer more effective management of DHT-related conditions. Additionally, its lower molecular weight hints at better potential for topical application, potentially offering advantages in treating conditions such as androgenic alopecia. Despite its potential, it has not advanced in development, possibly due to financial limitations, leaving its therapeutic prospects and side effect profile largely unexplored.

community Seeking Advice on Norwood 3 Hairline at Age 15

in Basic Questions 533 upvotes 8 months ago

A 15-year-old is concerned about hair loss, possibly at Norwood 2 or 3, and is using shampoos and conditioners recommended by a trichologist. Suggestions include considering topical minoxidil and consulting a doctor about topical anti-DHT treatments like finasteride or RU58841, but avoiding 5-alpha-reductase inhibitors at this age.

community Very agressive protection / regrowth stack on steroids

in Journals / Progress Pictures 223 upvotes 7 months ago

A 24-year-old with hair thinning is using a regimen including dutasteride, RU58841, HGH, GHK-cu, and other compounds to protect and regrow hair. They are also incorporating a mild cutting cycle with testosterone propionate, anavar, and tirzepatide.

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