High Quality Mesterolone(Proviron)Powder For Bodybuilding CAS:1424-00-6
Mesterolone, marketed primarily under the brand name Proviron, is a synthetic, orally active androgen. First developed in the 1960s, it is not a classic anabolic steroid in the traditional sense but is rather classified as a pure androgen or an androgen derivative.
What is Mesterolone (Proviron)?
Mesterolone, marketed primarily under the brand name Proviron, is a synthetic, orally active androgen. First developed in the 1960s, it is not a classic anabolic steroid in the traditional sense but is rather classified as a pure androgen or an androgen derivative. Its chemical structure is a derivative of dihydrotestosterone (DHT), to which it is very similar, with the addition of a methyl group at the first carbon position. This structural nuance is critical to its profile.
Unlike many anabolic steroids, mesterolone is not significantly converted (aromatized) into estrogen. Its primary mechanism of action is through direct and strong binding to androgen receptors throughout the body and, uniquely, by reducing the body's levels of Sex Hormone-Binding Globulin (SHBG). SHBG binds to sex hormones like testosterone, rendering them inactive. By lowering SHBG, mesterolone effectively increases the fraction of free, bioavailable testosterone and other anabolic steroids in the bloodstream.
In its pharmaceutical form, Proviron is a tablet. The reference to "High Quality Mesterolone Powder" typically pertains to the raw active pharmaceutical ingredient (API) in its pure, unsuppressed form, which is not intended for direct human consumption without pharmaceutical processing, precise dosing, and sterility assurance-standards impossible to guarantee in clandestine or underground lab (UGL) environments.
Features and Pharmacological Profile
●Androgenic Dominance: As a DHT-derivative, mesterolone exhibits strong androgenic properties. These effects are mediated in tissues like the skin, hair follicles, prostate, and central nervous system.
●Non-Estrogenic: It does not aromatize. Therefore, users do not experience estrogen-related side effects like gynecomastia (breast tissue development), water retention, or significant blood pressure spikes from fluid volume increase.
●Anti-Estrogenic Activity: Through competitive inhibition of the aromatase enzyme and by increasing the clearance of estradiol, it can exhibit mild anti-estrogenic effects. However, it is not a powerful aromatase inhibitor like Anastrozole.
●SHBG Reduction: This is one of its hallmark features. By binding tightly to SHBG, it displaces bound testosterone, increasing the free testosterone percentage.
●Low Anabolic Activity: It has a very low anabolic rating relative to its androgenic strength. It does not significantly promote nitrogen retention or protein synthesis in muscle tissue compared to steroids like testosterone or nandrolone.
●Oral Bioavailability: The 1-methyl group provides limited oral bioavailability, protecting it from rapid liver breakdown (first-pass metabolism), though not as effectively as the 17-alpha-alkyl group found in steroids like Dianabol. It is still considered hepatotoxic, but to a lesser degree than many other oral AAS.
Applications and Perceived Benefits in Bodybuilding
Within the performance-enhancement community, mesterolone is used for specific, ancillary purposes rather than as a primary mass-building agent.
●Androgen Receptor "Activation" & Hardening Effect: Its strong binding to androgen receptors is believed by some to create a "harder," more dense, and vascular muscle appearance, particularly when body fat levels are very low. It contributes to a "dry" look due to the lack of water retention.
●Free Testosterone Amplifier: During a steroid cycle containing testosterone or other compounds, it is used to lower SHBG, thereby increasing the effective potency and activity of the primary anabolics. This can theoretically improve cycle efficiency.
●Estrogen Management Aid: Used as a secondary line of defense against mild estrogenic side effects, often in conjunction with a primary aromatase inhibitor. It can help mitigate water retention and minor gynecomastia sensitivity.
●Libido Enhancement: Due to its strong androgenic nature and DHT-like effects, it is notoriously used to combat libido suppression that can occur from other steroids or during Post-Cycle Therapy (PCT). DHT is crucial for male sexual function.
●PCT Controversy: Its role in PCT is highly debated. While it can increase free testosterone and libido, it is itself suppressive of the hypothalamic-pituitary-testicular axis (HPTA). Using an exogenous androgen during a period meant to restart natural testosterone production is counterproductive for most. Therefore, informed users typically avoid it in PCT.
Dosage, Cycle Use, and Half-Life
●Pharmaceutical Dosage: Medically, it is prescribed at 25-150 mg per day, divided into doses.
●Bodybuilding Dosage: When used illicitly in a cycle, typical doses range from 25 mg to 100 mg per day, almost always divided into two doses (e.g., 25 mg twice daily). Doses above 100 mg are uncommon due to increased side effects without significant added benefit. It is rarely, if ever, run as a standalone compound.
●Cycle Integration: It is used as a supporting agent in cycles lasting 6-12 weeks. A common example: a cutter might use Testosterone Propionate (200-400mg/week) with Trenbolone Acetate and add Mesterolone at 50mg/day for the final 6 weeks to enhance muscle hardness and definition.
●Half-Life: The elimination half-life of mesterolone is approximately 12-14 hours. This necessitates split daily dosing to maintain stable blood levels.
Post-Cycle Therapy (PCT) Considerations
As stated, mesterolone is generally contraindicated in a standard PCT protocol. The goal of PCT is to stimulate the recovery of the HPTA using compounds like Selective Estrogen Receptor Modulators (SERMs: Clomiphene, Tamoxifen) and Human Chorionic Gonadotropin (hCG). Introducing an exogenous androgen like mesterolone will continue the suppression of luteinizing hormone (LH) and follicle-stimulating hormone (FSH), directly counteracting the SERMs' purpose. Any short-term libido benefit is outweighed by the prolonged recovery time.
Clinical Data
|
Trade names |
Proviron,Mesterolone,NSC-75054; SH-60723; SH-723;1α-Methyl-4,5α-dihydrotestosterone; 1α-Methyl-DHT; |
|
CAS |
1424-00-6 |
|
Molar mass |
304.474 |
|
Formula |
C20H32O2 |
|
Purity |
Above 98% |
|
Capacity/Bottle |
White crystalline powder |
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Conclusion: A Specialist Tool, Not a Foundation
Mesterolone (Proviron) occupies a unique niche in the spectrum of performance-enhancing drugs. It is not a cornerstone for mass or strength but a fine-tuning agent valued for its androgenic qualities, SHBG-binding ability, and anti-estrogenic properties. Its benefits are specific and context-dependent, primarily sought in the final stages of contest preparation.
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