Proviron (Mesterolone): Research, Dosing, and Where to Buy in 2026
A research-first profile for Proviron (Mesterolone) (Mesterolone, Provironum, Mesterolonum, Proviron 25), aggregating mechanism notes, transcript dosing mentions, vendor recommendations, and PubMed-indexed literature without presenting medical guidance.
Proviron is the brand name for mesterolone, a synthetic, orally active androgen derived from dihydrotestosterone (DHT). As of July 2026, The Peptide Wiki aggregates 7 PubMed-cited papers for Proviron (Mesterolone), each linked to its source.
- Also indexed as Mesterolone, Provironum, Mesterolonum, Proviron 25.
- Proviron is the brand name for mesterolone, a synthetic, orally active androgen derived from dihydrotestosterone (DHT). First marketed by Schering in the 1960s, it is a 1-methylated DHT analogue that resists liver...
- Mechanism notes include Mesterolone binds the androgen receptor and acts as an exogenous DHT-like androgen. Unlike testosterone it is not a substrate for aromatase, so it does not raise estrogen...
- 0 aggregated dosing-protocol mentions from source transcripts.
- 7 PubMed-indexed citations listed in the research table below.
- 0 vendor recommendations captured from named experts.
- Evidence level in this entry is marked as Clinical / pharmacological.
What is Proviron (Mesterolone)?
Proviron is the brand name for mesterolone, a synthetic, orally active androgen derived from dihydrotestosterone (DHT). First marketed by Schering in the 1960s, it is a 1-methylated DHT analogue that resists liver breakdown and does not convert (aromatize) to estrogen. It is classed as a weak anabolic-androgenic steroid, but clinically it is used as an androgen-replacement and male-fertility agent rather than as a muscle-building drug.
How does Proviron (Mesterolone) work?
Mesterolone binds the androgen receptor and acts as an exogenous DHT-like androgen. Unlike testosterone it is not a substrate for aromatase, so it does not raise estrogen levels. It also binds sex-hormone-binding globulin (SHBG) with high affinity, which can transiently raise the free fraction of a person's own testosterone and estradiol. It exerts negative feedback on the hypothalamic-pituitary-gonadal axis, so extended use can suppress natural testosterone production.
Mechanism note
These mechanisms are presented as research observations and hypotheses from the indexed data, not as confirmation of clinical effect in humans.
What is Proviron (Mesterolone) researched for?
In clinical practice mesterolone has been prescribed for symptoms of androgen deficiency (low testosterone) such as reduced libido, erectile difficulty, and low mood or energy; for male infertility linked to low sperm count or quality; and historically for delayed puberty in boys. Because it does not aromatize to estrogen, it has been used where estrogen-related effects such as gynecomastia or fluid retention are a concern. Among performance users it is treated as an ancillary 'hardening' or anti-estrogen-feel compound rather than a primary mass-builder, since its muscle-building potency is low. The Peptide Wiki lists this for education only and makes no treatment recommendation.
Proviron (Mesterolone) Dosing Protocols
The entries below are transcript-derived dosing mentions. They are preserved for research context and are not medical advice.
No transcript-derived dosing mentions in current source set.
Where to Buy Proviron (Mesterolone) in 2026
No tracked vendor recommendations for Proviron (Mesterolone) yet. See our vendor directory.
Side Effects and Safety
Anecdotal reports and study-level observations vary by route, dose, and individual. This page does not provide medical advice. Consult a qualified clinician before any research use.
User Reviews
User reviews aggregator coming Q3 2026 (Reddit + YouTube comments + Discord research notes). Until then, see the expert quote section above and PubMed citations below.
Research Efficacy Snapshot
Published efficacy percentages cited in PubMed trials and named-expert reports about Proviron (Mesterolone). Each line links to the original source.
- "The sperm of 93% of the patients improved or stayed unchanged." · Nikkanen V et al, 1978 PubMed
- "30% of the patients developed normozoospermia." · Nikkanen V et al, 1978 PubMed
Research and Studies
7 PubMed-indexed papers reference Proviron (Mesterolone). Top 7 shown.
Legal Status
Proviron (Mesterolone) is presented here as a research compound. FDA approval status, scheduling, WADA status, and state-specific telehealth rules may apply. Always verify current regulatory status. Last verified: 2026-07-09.
Frequently Asked Questions
What is Proviron (Mesterolone)?
Proviron is the brand name for mesterolone, a synthetic, orally active androgen derived from dihydrotestosterone (DHT). First marketed by Schering in the 1960s, it is a 1-methylated DHT analogue that resists liver breakdown and does not convert (aromatize) to estrogen. It is classed as a weak anabolic-androgenic steroid, but clinically it is used as an androgen-replacement and male-fertility agent rather than as a muscle-building drug.
Is Proviron (Mesterolone) FDA-approved?
Proviron (Mesterolone) is presented on this page as a research compound. FDA approval status, scheduling, and state-specific rules may apply and change. Verify current regulatory status before any decision.
How much research has been published on Proviron (Mesterolone)?
7 PubMed-indexed paper(s) reference Proviron (Mesterolone) in our current research feed. See the Research and Studies section above for citations.