Non-peptide

Mesterolone

Also known as

Proviron · Provironum · Androviron · 1-methyl-DHT · 1α-methyl DHT · oral DHT derivative

Community talk. May contain inaccuracies. Not medical advice. Not a protocol. Not for human or animal use.

What it is

Proviron	Mesterolone is an oral DHT-derived androgen discussed as a testosterone/TRT add-on for libido, mood and a harder, drier appearance.
SHBG discussion	SHBG is a blood protein that carries sex hormones. A lower result does not itself mean better libido, mood or more muscle.
DHT in plain language	DHT is dihydrotestosterone, a hormone related to testosterone. Mesterolone is a modified form of that hormone, distinct from testosterone itself.

Notes

Mesterolone, better known as Proviron, is an oral DHT-derived androgen discussed as a testosterone or TRT add-on. People seek more libido, better mood and a harder, drier appearance rather than large muscle gains. Reports also describe no benefit, fading benefit or feeling worse.

An androgen tablet, distinct from testosterone. DHT means dihydrotestosterone, a hormone related to testosterone. Mesterolone is a modified DHT compound, distinct from testosterone cypionate, SARMs and Masteron. Users usually discuss swallowing tablets alongside other hormones.

SHBG is a binding protein, not a well-being score. Sex hormone-binding globulin carries sex hormones in blood. “Free T” means testosterone not bound to those proteins. A lower SHBG result does not by itself mean more libido, better mood or more muscle.

What people notice

Libido and mood vary	Some TRT users describe more sexual interest and confidence; others feel nothing, emotionally flat or less interested. An initial lift can fade despite continued use.
Drier appearance	Older reports emphasize less puffiness, visible veins and cosmetic hardening, with limited expectations for adding muscle size.

Notes

More sexual interest and a better mood. TRT reports describe more drive and confidence, but also reduced desire and emotional flatness. Sexual interest differs from erection hardness: someone may still get an erection while having little spontaneous desire.

Positive, unchanged and adverse libido reports coexist. A Testosterone thread includes marked libido at 25 mg/day, a commenter who could not feel Proviron, and discombober11 describing lost libido after prolonged use with SHBG reportedly at 6. That number had no stated unit, and their causal theory remains unproven. Proviron experiences (Community discussion · Accessed 2026-09-30)

An initial lift can fade after 15–21 days. gusamaso described strong early libido, then a drop despite continuing use alongside testosterone and hCG. [Compounds] Proviron (Mesterolone), April thread (Community discussion · Accessed 2026-09-30)

A drier appearance, with limited muscle-building expectations. Older accounts emphasize less puffiness, visible veins and cosmetic “hardening,” sometimes comparing it with Masteron. Others call it weak for gaining size. Physique impressions are not measured muscle gains.

Source context — Proviron experiences: Amounts and lab units are incomplete; personal causal theories are not adopted. Displayed relative timestamps not converted.

Source context — [Compounds] Proviron (Mesterolone), April thread: Anonymous co-use reports; nested replies remain single-author timelines. Relative reply dates not reconstructed.

Doses people talk about

Oral daily reports	25–30 mg/day and 50 mg/day are separate TRT-adjunct examples. A reported split 50 mg day means 25 mg in the morning plus 25 mg in the evening.
Higher amounts	60–80 mg or more appears in discussion. One user reported more hair and prostate symptoms at 100 mg; another found no extra benefit at 75 or 100 versus 50 mg/day.

Notes

Oral daily totals: 25–30 mg and 50 mg are separate reports. TRT-adjunct discussion includes 25–30 mg/day and 50 mg/day split morning and afternoon. Mixed higher-amount talk includes 60–80 mg or more. These describe discussion, not recommended amounts or a reason to escalate.

A split 50 mg day means 25 mg twice. Pumped_ described 25 mg morning plus 25 mg evening, totaling 50 mg/day, throughout a testosterone cycle. Proviron — Damike discussion (Community discussion · Accessed 2026-09-30)

Higher amounts do not give a consistent better result. In a 2022 forum, zwhit described more hair and prostate symptoms at 100 mg; charles bacon reported no extra benefit at 75 or 100 versus 50 mg/day. Proviron higher than 50mg/day (Community discussion · Accessed 2026-09-30)

Source context — Proviron — Damike discussion: Source-review/promotional forum; confident safety claims not adopted. The circulated 12-hour claim matches Bayer label kinetics, not a forum measurement.

Source context — Proviron higher than 50mg/day: Commercial representatives/sponsored accounts participate. Separate users, no denominator; liver safety assurance rejected.

Half-life, onset & duration

Felt onset	One report describes libido effects around day three; another around day 14. A separate account's numbness after about an hour was an adverse response, not desired onset.
Felt duration	An early libido lift faded after 15–21 days in one account. After stopping, another described five days of full sexual effects then five days of fading; these do not time a single dose.
Half-life	Bayer's saved label reports a terminal blood half-life of 12–13 hours. The forum's roughly 12-hour clock is not a measurement of mood or libido duration.

Notes

Days in one report, about two weeks in another. Tall Deck reported libido effects by roughly day three at 50 mg/day. Separately, jrlwesternsprings noticed a change around day 14. Onset is not dependable. Does Proviron increase Libido? (Personal report · Accessed 2026-09-30) · [Compounds] Proviron (Mesterolone), April thread (Community discussion · Accessed 2026-09-30)

An early sensation can be unwanted. Fun_Ad_2841 reported numbness about an hour after 25 mg alongside testosterone, then reduced desire over weeks. This was an adverse response. [Compounds] Proviron (Mesterolone), April thread (Community discussion · Accessed 2026-09-30)

After stopping, accounts describe different timelines. jrlwesternsprings reported full sexual effects for five days after stopping, fading over another five. HelloGainz felt better within one to two days off after headaches during use. Neither measures clearance. Earlier records also mention mood drops after stopping. [Compounds] Proviron (Mesterolone), April thread (Community discussion · Accessed 2026-09-30)

Manufacturer terminal half-life: 12–13 hours. Bayer reports that blood concentration halves over this period in the final elimination phase. This does not predict how long mood, libido or appearance changes last. Proviron Summary of Product Characteristics (Official context · Accessed 2026-09-30)

About 12 hours circulates in forum timing talk. BrainsNGainz repeated 12 hours while discussing once-daily use; older accounts use it to explain morning/evening splits. This is pharmacokinetic lore, not a half-life measured by those users. The matching manufacturer value appears below. Felt mood is not an elimination clock. Proviron — Damike discussion (Community discussion · Accessed 2026-09-30)

Source context — Does Proviron increase Libido?: Uncontrolled personal report in commercial forum. The urinary complaint in this particular comment refers to Masteron, not Proviron.

Source context — [Compounds] Proviron (Mesterolone), April thread: Anonymous co-use reports; nested replies remain single-author timelines. Relative reply dates not reconstructed.

Source context — Proviron Summary of Product Characteristics: Manufacturer medical-label context from an overseas authorization; not a bodybuilding efficacy or safety study. Terminal serum half-life differs from symptom duration. One source family even when repeated on forums.

Cycles people discuss

TRT add-ons and finishing runs	Open-ended TRT use and several-week contest-prep or cutting windows both appear. They do not establish one agreed course or repeat calendar.
Long and short use	One person describes 50 mg daily year-round; others stop quickly when they feel worse. Exposure length is not proof of long-term safety.

Notes

Open-ended TRT add-ons and short finishing runs both appear. Older discussion includes continued TRT use and several-week contest-prep or cutting windows. It does not supply one agreed course or repeat calendar. These contexts describe use alongside testosterone, not a replacement for it.

Some describe year-round use; others stop quickly. Ach301uz reported 50 mg daily year-round. Length of exposure does not establish long-term safety. [Compounds] Proviron (Mesterolone), April thread (Community discussion · Accessed 2026-09-30)

A lower SHBG result did not mean feeling better. BamaCrazy reported 25 mg twice daily with testosterone and Primobolan, stopping on day nine because they disliked the feeling. SHBG was 79.4 before and 37.3 two days after stopping. Multiple hormones prevent isolating the cause. Proviron vs SHBG (Personal report · Accessed 2026-09-30)

Source context — [Compounds] Proviron (Mesterolone), April thread: Anonymous co-use reports; nested replies remain single-author timelines. Relative reply dates not reconstructed.

Source context — Proviron vs SHBG: Self-reported bloodwork with ongoing testosterone and Primobolan; possible combined effects acknowledged by author. Numeric improvement is not symptom benefit.

Stacks

Testosterone and hCG	Testosterone/TRT is the usual pairing, with hCG also named in accounts. This is add-on discussion rather than replacing testosterone.
Primobolan co-use	One user took 25 mg twice daily alongside testosterone and Primobolan, disliked the feeling and stopped on day nine. Their lower SHBG result did not mean feeling better.

Notes

+ Testosterone / TRT: The main saved accounts describe this pairing, sometimes with hCG or Primobolan. Co-use prevents attributing every effect to mesterolone. [community]

+ HCG is named as the other “feel” add-on in the same X threads. [community]

Co-use and product identity complicate comparisons. Reports pair Proviron with testosterone and sometimes hCG; counterfeit complaints also occur. SHBG, free testosterone, estradiol, red-blood-cell levels, prostate markers and cholesterol feature in the discussion. Those observations cannot authenticate a product or explain a symptom by themselves.

Watch for

Hair, skin and urinary symptoms	Accounts include hair loss, acne, oily skin and prostate concerns. One reports urinary retention and interrupted flow that improved off and recurred on retry.
Mood, sleep and lab tradeoffs	Insomnia, dry joints and acne followed an early good feeling in one account. A separate solo account reports lower HDL cholesterol, elevated liver enzymes and little benefit.
Consequential label warnings	The saved Bayer label excludes prostate cancer and liver tumours and warns about cardiovascular, liver and psychiatric harms with steroid abuse, plus injury from prolonged erections.
U.S. controlled-substance context	The saved DEA record lists mesterolone as Schedule III; no U.S. FDA approval was identified in the article's check. Sharing a Plan can expose this controlled-substance entry.

Notes

Hair, skin and urinary complaints matter. Earlier reports include hair loss, acne, oily skin and prostate concerns. In a 2020 thread, one user described new urinary retention and interrupted flow within about five days, a reported doctor assessment of enlargement, improvement after stopping, and recurrence on retry. That remains one account. [Compounds] Proviron (Mesterolone), February thread (Community discussion · Accessed 2026-09-30)

The “honeymoon” can include insomnia and joint discomfort. Another 2020 commenter reported initially better libido and well-being at 25 mg/day on TRT, then insomnia, dry joints and acne. Their “low estrogen” explanation was an interpretation, not a confirmed diagnosis. [Compounds] Proviron (Mesterolone), February thread (Community discussion · Accessed 2026-09-30)

A solo experiment was not reassuring to every user. Pcushion recalled hormone suppression during a ten-week, escalating oral experiment, but could not produce the original lab sheets. XmadXscientist reported eight weeks at 25–50 mg/day with little benefit, lower HDL cholesterol and elevated liver enzymes. These uncontrolled histories do not settle suppression thresholds. The Proviron Experiment — Pcushion (Community discussion · Accessed 2026-09-30)

Bayer warns about consequential risks. The label excludes prostate cancer and liver tumours, limits use to males, and warns about cardiovascular, hepatic and psychiatric harms with steroid abuse. Prolonged erections can cause injury. Proviron Summary of Product Characteristics (Official context · Accessed 2026-09-30)

U.S. control and overseas medical use are different facts. DEA lists mesterolone as Schedule III. No U.S. FDA approval was identified for mesterolone. An overseas Proviron label does not establish U.S. approval. Sharing a Plan containing this identity can expose the controlled-substance entry to others. DEA Orange Book controlled-substance list (Official context · Accessed 2026-09-30) · openFDA Drugs@FDA active-ingredient query (Official context · Accessed 2026-09-30)

Source context — [Compounds] Proviron (Mesterolone), February thread: Clinical assessment is self-reported; symptoms cannot diagnose estrogen levels. Multiple agents and pre-existing conditions confound attribution.

Source context — The Proviron Experiment — Pcushion: Retrospective experiment reportedly performed in 2012; lab sheets unavailable. Anonymous second user; uncontrolled, not a dose threshold study. Commercial source-review environment.

Source context — DEA Orange Book controlled-substance list: U.S. federal classification only; no interpretation of individual possession, prescribing or import situations.

Source context — openFDA Drugs@FDA active-ingredient query: No-match search is qualified as no matching product, not complete proof of every possible spelling or database lag. Historical profile says not FDA-approved; no new approval claim added.

Full notes

What Proviron is and what the hormone talk means

An androgen tablet, distinct from testosterone. DHT means dihydrotestosterone, a hormone related to testosterone. Mesterolone is a modified DHT compound, distinct from testosterone cypionate, SARMs and Masteron. Users usually discuss swallowing tablets alongside other hormones. Community
SHBG is a binding protein, not a well-being score. Sex hormone-binding globulin carries sex hormones in blood. “Free T” means testosterone not bound to those proteins. A lower SHBG result does not by itself mean more libido, better mood or more muscle. Community
Proviron is not converted into estrogen. Bayer describes no conversion to estrogens. That does not establish that Proviron controls estrogen produced from other drugs. Official context

Benefits people seek

More sexual interest and a better mood. TRT reports describe more drive and confidence, but also reduced desire and emotional flatness. Sexual interest differs from erection hardness: someone may still get an erection while having little spontaneous desire. Community
A drier appearance, with limited muscle-building expectations. Older accounts emphasize less puffiness, visible veins and cosmetic “hardening,” sometimes comparing it with Masteron. Others call it weak for gaining size. Physique impressions are not measured muscle gains. Community

Doses people discuss

Oral daily totals: 25–30 mg and 50 mg are separate reports. TRT-adjunct discussion includes 25–30 mg/day and 50 mg/day split morning and afternoon. Mixed higher-amount talk includes 60–80 mg or more. These describe discussion, not recommended amounts or a reason to escalate. Community
A split 50 mg day means 25 mg twice. Pumped_ described 25 mg morning plus 25 mg evening, totaling 50 mg/day, throughout a testosterone cycle. Eroids
Higher amounts do not give a consistent better result. In a 2022 forum, zwhit described more hair and prostate symptoms at 100 mg; charles bacon reported no extra benefit at 75 or 100 versus 50 mg/day. Anabolic Steroid Forums

Half-life: the circulated claim and its origin

About 12 hours circulates in forum timing talk. BrainsNGainz repeated 12 hours while discussing once-daily use; older accounts use it to explain morning/evening splits. This is pharmacokinetic lore, not a half-life measured by those users. The matching manufacturer value appears below. Felt mood is not an elimination clock. Eroids Community

Onset: when people notice a change

Days in one report, about two weeks in another. Tall Deck reported libido effects by roughly day three at 50 mg/day. Separately, jrlwesternsprings noticed a change around day 14. Onset is not dependable. Personal report Reddit r/steroids
An early sensation can be unwanted. Fun_Ad_2841 reported numbness about an hour after 25 mg alongside testosterone, then reduced desire over weeks. This was an adverse response. Reddit r/steroids

Duration: how long the reported feeling lasts

An initial lift can fade after 15–21 days. gusamaso described strong early libido, then a drop despite continuing use alongside testosterone and hCG. Reddit r/steroids
After stopping, accounts describe different timelines. jrlwesternsprings reported full sexual effects for five days after stopping, fading over another five. HelloGainz felt better within one to two days off after headaches during use. Neither measures clearance. Earlier records also mention mood drops after stopping. Reddit r/steroids Community

Cycles and longer use people describe

Open-ended TRT add-ons and short finishing runs both appear. Older discussion includes continued TRT use and several-week contest-prep or cutting windows. It does not supply one agreed course or repeat calendar. These contexts describe use alongside testosterone, not a replacement for it. Community
Some describe year-round use; others stop quickly. Ach301uz reported 50 mg daily year-round. Length of exposure does not establish long-term safety. Reddit r/steroids

Good to know before interpreting a positive report

Hair, skin and urinary complaints matter. Earlier reports include hair loss, acne, oily skin and prostate concerns. In a 2020 thread, one user described new urinary retention and interrupted flow within about five days, a reported doctor assessment of enlargement, improvement after stopping, and recurrence on retry. That remains one account. Community Reddit r/steroids
The “honeymoon” can include insomnia and joint discomfort. Another 2020 commenter reported initially better libido and well-being at 25 mg/day on TRT, then insomnia, dry joints and acne. Their “low estrogen” explanation was an interpretation, not a confirmed diagnosis. Reddit r/steroids
Bayer warns about consequential risks. The label excludes prostate cancer and liver tumours, limits use to males, and warns about cardiovascular, hepatic and psychiatric harms with steroid abuse. Prolonged erections can cause injury. Official context
U.S. control and overseas medical use are different facts. DEA lists mesterolone as Schedule III. No U.S. FDA approval was identified for mesterolone. An overseas Proviron label does not establish U.S. approval. Sharing a Plan containing this identity can expose the controlled-substance entry to others. Official context Official context Community

Community: feeling better, feeling nothing and feeling worse

A lower SHBG result did not mean feeling better. BamaCrazy reported 25 mg twice daily with testosterone and Primobolan, stopping on day nine because they disliked the feeling. SHBG was 79.4 before and 37.3 two days after stopping. Multiple hormones prevent isolating the cause. Personal report
Positive, unchanged and adverse libido reports coexist. A Testosterone thread includes marked libido at 25 mg/day, a commenter who could not feel Proviron, and discombober11 describing lost libido after prolonged use with SHBG reportedly at 6. That number had no stated unit, and their causal theory remains unproven. Reddit r/Testosterone
Bodybuilding “feel-good” talk has a tradeoff. zwhit described mental and cosmetic benefits alongside androgenic symptoms at higher amounts. Commercial representatives also participate; enthusiasm and blanket liver-safety claims are not independent safety evidence. Anabolic Steroid Forums
A solo experiment was not reassuring to every user. Pcushion recalled hormone suppression during a ten-week, escalating oral experiment, but could not produce the original lab sheets. XmadXscientist reported eight weeks at 25–50 mg/day with little benefit, lower HDL cholesterol and elevated liver enzymes. These uncontrolled histories do not settle suppression thresholds. Eroids
Biohacking energy claims involve a different route and population. A NooTopics author reported less brain fog, more energy and libido over 18 months, but disclosed low testosterone and rectal use of tablet fragments. Replies challenged their assumptions about absorption. This is not evidence for equivalent oral dosing, a cognition treatment or freedom from suppression. Personal report
Co-use and product identity complicate comparisons. Reports pair Proviron with testosterone and sometimes hCG; counterfeit complaints also occur. SHBG, free testosterone, estradiol, red-blood-cell levels, prostate markers and cholesterol feature in the discussion. Those observations cannot authenticate a product or explain a symptom by themselves. Community

Supporting context: measured timing is a different question

Manufacturer terminal half-life: 12–13 hours. Bayer reports that blood concentration halves over this period in the final elimination phase. This does not predict how long mood, libido or appearance changes last. Official context