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Proviron (Mesterolone): the honest profile
Mesterolone, an oral DHT derivative used mainly as an ancillary rather than a primary muscle-builder. Binds SHBG to free up testosterone, adds an androgenic "hardening" effect, and can improve libido. Not 17α-alkylated, so liver load is low. This is an evidence-graded harm-reduction reference — the compound profile (how it behaves and what that means for side-effect management), what it's used for, reported dosing, and the risks that actually matter. It is educational, not medical advice, and not encouragement to use a controlled substance.
- • Proviron (Mesterolone) — dht-derived, does not aromatize, injectable.
- • Suppression: mild — plan recovery/PCT and post-cycle bloodwork.
- • Used for increasing free testosterone (shbg binding), cosmetic hardening on cycle, libido support.
- • Legal: Schedule III controlled substance (US), WADA-banned — this is harm-reduction education, not encouragement to use.
What Proviron (Mesterolone) is
Mesterolone, an oral DHT derivative used mainly as an ancillary rather than a primary muscle-builder. Binds SHBG to free up testosterone, adds an androgenic "hardening" effect, and can improve libido. Not 17α-alkylated, so liver load is low. Mesterolone, a non-17α-alkylated oral DHT derivative. Low hepatic load and low suppression; used as an ancillary - binds SHBG and adds androgenic hardening. Not a true anti-estrogen.
Compound profile — and why each row matters
The behaviour of an anabolic is mostly predictable from a few structural facts. Here is Proviron (Mesterolone)'s profile, with the management implication of each:
| Androgen family | DHT-derived — Sets the base behaviour and side-effect family. |
| Aromatizes to estrogen | No — No estrogen conversion — classic estrogenic sides (bloat, gyno) are not driven by this compound. |
| 17α-alkylated (oral) | No — Not 17α-alkylated; not liver-toxic by that mechanism. |
| Suppresses natural testosterone | Mild — Expect shutdown — a recovery/PCT plan and post-cycle bloodwork matter. |
| Hepatic load | Minimal — Low hepatic burden. |
| Prolactin risk | None |
| Hematocrit (RBC) risk | Low — Lower red-cell impact. |
| Half-life | Approximately 12 hours — Drives injection frequency and how long it lingers post-cycle (PCT timing runs off the slowest ester). |
What Proviron (Mesterolone) is used for
- • Increasing free testosterone (SHBG binding)
- • Cosmetic hardening on cycle
- • Libido support
- • Mild anti-estrogenic / androgenic add-on
Reported dosing
| Oral | 25-100mg daily. Common: 25-50mg daily as an ancillary. Higher (75-100mg) for a stronger hardening/libido effect. |
Commonly-reported ranges, presented for harm reduction and information only — not a dose recommendation. Doses, esters, and cycle length are decisions for a supervising clinician; higher doses raise risk more than results.
Cycling, suppression & recovery
Usually run alongside other compounds for the duration of a cycle rather than as a standalone builder. Low suppression and low hepatic load make it well tolerated at typical doses. Because Proviron (Mesterolone) causes mild suppression of natural testosterone, a recovery plan (post-cycle therapy) and honest expectations about the come-down matter — see how a restart works and the broader cycle-structure guide.
Side effects & the labs that catch them
- • Hair loss in predisposed individuals
- • Acne and oily skin
- • Prostate effects at high doses
- • Mild cholesterol shifts
- • Virilization in women
Not approved for human performance use. Generally well tolerated and non-17α-alkylated, but it is strongly androgenic - hair loss and prostate effects are the main concerns. Not a substitute for an aromatase inhibitor. The bloodwork that carries a cycle — lipids, hematocrit, liver markers, and the hormone panel — is covered in the bloodwork guide.
Tracking Proviron (Mesterolone) in OptiPin
If you're running a cycle that includes Proviron (Mesterolone), OptiPin keeps every compound, dose, injection date, and lab on one timeline — with cycle-phase tagging so an off-week reads correctly, estimated clearance from each ester's half-life, and a phase-aware lab checklist. Your own data, on your device, ready to hand to a clinician.
Compounds, doses, phases & labs on one timeline
Cycle phase tracking, estimated clearance, and a phase-aware bloodwork checklist — private, on-device.
Download on the App StoreFAQ
What is Proviron (Mesterolone)?
Mesterolone, an oral DHT derivative used mainly as an ancillary rather than a primary muscle-builder. Binds SHBG to free up testosterone, adds an androgenic "hardening" effect, and can improve libido. Not 17α-alkylated, so liver load is low.
Does Proviron (Mesterolone) need an aromatase inhibitor?
Proviron (Mesterolone) does not aromatize to estrogen, so an aromatase inhibitor is generally not relevant for it. If run alongside a compound that does aromatize (like testosterone), estrogen management is about that compound, not Proviron (Mesterolone).
Is Proviron (Mesterolone) liver-toxic?
Proviron (Mesterolone) is not 17α-alkylated, so it does not carry the oral first-pass liver toxicity of methylated orals. It still has other risks (see the profile and side effects).
How is Proviron (Mesterolone) dosed?
Commonly reported: Oral — 25-100mg daily. Common: 25-50mg daily as an ancillary. Higher (75-100mg) for a stronger hardening/libido effect.. This reflects community-reported patterns for harm reduction, not a recommendation — Proviron (Mesterolone) is a controlled substance and dosing should involve a supervising clinician.
What are Proviron (Mesterolone)'s side effects?
Reported effects include: hair loss in predisposed individuals, acne and oily skin, prostate effects at high doses, mild cholesterol shifts, virilization in women. Anabolic steroids also carry cardiovascular, lipid, and fertility risks that are not always reversible; serial bloodwork is how these are caught early.
Is Proviron (Mesterolone) legal?
Proviron (Mesterolone) is an anabolic-androgenic steroid — a Schedule III controlled substance in the US (prescription-only, illicit without one) with similar restrictions in many countries, and it is on the WADA prohibited list for tested athletes. Legal status varies by jurisdiction; know your local law.
Evidence & further reading
- Search the peer-reviewed literature for Mesterolone on PubMed (entry point to the primary evidence, not a specific citation).
- US DEA — anabolic steroids fact sheet (Schedule III controlled-substance status).
- How a cycle is structured & what to track · Bloodwork to monitor on cycle.
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Superdrol · Trenbolone · Turinabol · Winstrol · Cycle structure · PCT / restart · Bloodwork · All anabolics