| HS Code | 580361 |
| Name | Mesterolone |
| Brand Names | Proviron |
| Chemical Formula | C20H32O2 |
| Molecular Weight | 304.47 g/mol |
| Drug Class | Androgen; Anabolic steroid |
| Route Of Administration | Oral |
| Cas Number | 1424-00-6 |
| Half Life | 12-13 hours |
| Legal Status | Prescription only (varies by country) |
| Primary Use | Treatment of male hypogonadism and infertility |
| Appearance | White or almost white crystalline powder |
| Metabolism | Hepatic |
| Excretion | Urine |
| Protein Binding | High |
| Origin | Synthetic derivative of dihydrotestosterone (DHT) |
As an accredited Mesterolone factory, we enforce strict quality protocols—every batch undergoes rigorous testing to ensure consistent efficacy and safety standards.
| Packing | The packaging for Mesterolone consists of a white, sealed box containing 50 tablets, each 25mg, with clear labeling and safety instructions. |
| Shipping | Mesterolone is shipped in tightly sealed, compatible containers, protected from moisture, heat, and direct sunlight. Packages are clearly labeled in accordance with relevant regulations. Shipping must comply with local, national, and international guidelines for controlled substances. Appropriate documentation and handling precautions are ensured during transit to maintain product integrity and safety. |
| Storage | Mesterolone should be stored in a tightly closed container at room temperature, ideally between 20°C and 25°C (68°F and 77°F). It must be kept away from moisture, direct light, and heat sources. Store in a cool, dry, and well-ventilated area, out of reach of children and incompatible substances. Follow any additional storage guidelines provided by the manufacturer. |
Competitive Mesterolone prices that fit your budget—flexible terms and customized quotes for every order.
For samples, pricing, or more information, please contact us at +8615365186327 or mail to admin@ascent-chem.com.
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Tel: +8615365186327
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At our facility, producing mesterolone is more than a chemical reaction—it's a commitment to consistency, precision, and a clear understanding of what customers genuinely face at the bench or on the production floor. Mesterolone, commonly known by its chemical structure as 1α-methyl-5α-androstan-17β-ol-3-one, forms part of a family of compounds shaped through careful organic synthesis. This product has built its reputation among end-users who demand reliability, accurate process control, and a supplier that understands the pressures of maintaining both throughput and purity.
Inside our plant, synthesis of mesterolone follows a set regimen, not just because the molecules demand it, but because the customers who use our material set their expectations high. The pharmaceutical sector, for one, cannot afford batch variation. They have trust in us to match product composition between kilograms and across time, so tablets pressed today respond identically to those pressed last year. We perform HPLC and GC purity analyses on each lot, then verify signature markers by NMR to make sure no unseen byproducts slip through. Many ask about achievable assay values; we regularly bring assay above 99%. Impurities like related steroids or residual solvents stay far below their ICH limits.
What arrives at your dock is a fine white or off-white crystalline powder with a bulk density tailored for ease of scooping and mixing. Particle size may sound like a technicality, but those using modern blenders or tablet presses understand it makes all the difference: too fine, you get hang-ups or dusting; too coarse, you see uneven dispersion. Our standard model features a mean particle size in the mid- to low-micron range, avoiding the headaches that come with poor flow or inconsistent dosing. Moisture content always draws scrutiny on the production line—ours stays well below 0.5%, with tight, sealed packaging at origin. Each unit comes vacuum-packed under nitrogen to minimize risk of surface oxidation.
Anyone in pharmaceutical R&D or finished dosage manufacturing who has fielded a call about 'tableting issues' with androgenic agents knows the importance of a responsive producer. Mesterolone works best in oral solid dose form; its chemical stability under standard tableting conditions has earned it a favored role for certain niche therapies. Some partners turn to us because their internal teams notice less batch-to-batch variability with our lot than with alternatives—less trouble with dissolution rates or compression dynamics. A common practice involves blending mesterolone directly with standard excipients, often milled or granulated with microcrystalline cellulose. Maintaining consistency in potency and bioavailability is central to these applications, especially as regulatory authorities scrutinize every change in API supplier.
Colleagues ask us why we focus so much energy on process optimization, even after hitting standard specification. The answer often lies not in the big, obvious numbers like assay or color, but in subtle markers: absence of trace side products, reliable moisture control, physical behavior under compression, or repeatable solubility in formulation solvents. Those who have tried generic anabolic steroids or androgenic APIs from multiple sources recognize wide variation in powder quality, flow, and limits of detection for trace residues. Often, this comes down to differences in crystallization steps, filtration practices, or handling conditions in final isolation. We draw on years working with both small-batch specialty synthesis and larger scale runs to reduce the odds of quality drift. Our approach has been shaped by audits from multinational partners, their in-depth questions always reinforcing the importance of thorough root-cause analysis and feedback loops.
Our phones ring for a reason—end users don’t have time for late shipments or quality hiccups that force retesting. The broader API and excipient landscape has seen consolidation and, at the same time, market instability from global events, logistical challenges, and shifting regulations. Each of these puts pressure on buyers to find partners who deliver what is promised, not just on paper but in practice. We deal directly with regulatory teams from customer organizations who want full traceability: audit trails for every lot, certificates that reflect actual test results (not averages), and sample retention that allows long-term review if disputes arise. These documentation standards are baked into our own systems, a necessity rooted in the reality that a single out-of-spec shipment can halt development for weeks.
Anyone who has run a multi-step organic synthesis at scale knows how easily traces of solvent, raw material, or process intermediate can stick around despite best practices. When making mesterolone, it’s crucial not to underestimate the risks of process deviations or small lapses in GMP discipline. Early on, we decided to invest in enhanced inline solvent monitoring and post-filtration sampling rather than only relying on end-point release testing to catch problems. Any deviation in oxidation step or crystallization temperature echoes downstream in impurity profile or physical form. Some facilities try to push batch size higher at the expense of yield per cycle, but this strategy often breeds risk: higher solvent load, more variable cooling, and greater potential for isolate disruption. We hold firm to tighter volume control, slower precipitation, and exhaustive drying cycles—all informed by both regulatory requirements and lessons learned from real deviations that once cost us dearly.
Even though pharmaceutical applications make up the bulk of our orders, we’ve seen demand from academic research, specialty compounding, and analytical standards producers. In academic labs, there’s little forgiveness for off-spec material; a failed experiment due to unexpected contaminants can waste weeks of work. Our technical support team regularly fields questions from lab managers and grad students who track ELSD peaks or notice odd TLC spots as a sign of impurity. Drawing on our detailed NMR and mass spec data, we’re able to offer guidance on solubility, compatibility with buffers, or alternate dissolution protocols when stubborn aggregates form.
It’s not unusual for process chemists or analytical techs to reach out to us after a few trial runs with mesterolone. Tabulating returns, off-notes, or user complaints goes beyond paperwork; it forms the basis for continual process revision inside the plant. Several years back, a formulation group encountered unexpected caking in their blend when they switched to our model from a European competitor. After digging into humidity maps and tracking every lot delivered, we found a flaw in our post-drying storage system. Since then, we pull samples from commercial packaging, not just freshly processed powder, and evaluate conditions at both origin and user site. Implementing these changes cut returns and call-backs by three-quarters the following year.
Experience shows that mesterolone stands apart from several other anabolic or androgenic steroids in ways that users only appreciate with real-world production or research challenges. Where some compounds fall short, like providing reliable dissolution profile or resisting oxidative degradation, our mesterolone holds up due to tighter upstream controls. Its unique methylation pattern at the 1-alpha position resists metabolic breakdown that plagues similar agents. Competing steroid APIs sometimes show more variability in melting point or hydroscopicity, hindering downstream processes. Our product’s physical and chemical stability under typical room temperature storage means less product lost to spoilage or rework—a real consideration on a busy warehouse floor or in countries with fluctuating climate control. Many users also recognize the difference in color and odor, outcomes of higher purity and lower residual solvent content from our improved isolation steps.
Industrial-scale tableting demands more than just theoretical knowledge—real output hinges on a product’s physical behavior under pressure. Mesterolone’s compactable, consistent nature means fewer press jams and faster run times. Excipients blend smoothly; granulation doesn’t stick; the consistent powder profile ensures even drug distribution across each batch. Our team has worked through tablet compression surveys with customers facing yield loss due to flow irregularities or capping. Smoothing the path for operators in the plant, minimizing cycle interruptions, ranks high on our priority list. It’s not just about the milligrams—it’s about hours saved and product loss avoided.
Audit teams often dig as deep as batch processing logs, chromatography raw files, and temperature records from transport. Our process incorporates both digital and paper records, cross-verified and reviewed before a single unit is released for shipment. Many users have praised not just the product’s functional consistency but the transparency with which we disclose everything from raw starting materials to final packaging integrity tests. While some smaller firms offload responsibility to intermediaries, we retain storage samples, run parallel stability tests, and assign a direct manufacturing contact for every order over a certain threshold. If a concern arises, troubleshooting starts in hours, not days or weeks.
Over the past decade, shifts in global regulatory frameworks and heightened enforcement have fundamentally shaped how we manage our mesterolone line. In our environment, preparation for audits, whether announced or unannounced, remains a daily activity, not a fire drill. Internal reviews of Standard Operating Procedures, ongoing GMP training, and supplier oversight reflect the reality of heightened scrutiny from authorities across continents. Having faced real audits from major regulatory bodies, we know that documentation, process discipline, and transparency aren’t optional extras—they’re the baseline for continued market access. By integrating feedback from inspectors and internal teams, we’ve hardened product lines against the types of issues that force recalls or create supply bottlenecks down the line.
Few outside chemical manufacturing appreciate the subtle disasters posed by an overlooked packaging flaw or storage lapse. Mesterolone, like many fine organic powders, deserves careful environmental monitoring through the shipping chain. More than once we’ve fielded urgent requests to reship or re-certify lots due to unforeseen customs delays or exposure to temperature extremes. To counter these issues, we upgraded our packaging years ago from standard poly-bags to multi-layer foil packs under inert gas, minimizing both moisture ingress and oxidation—even on long sea voyages. We keep stability samples on hand for each shipment, running ongoing assays and physical tests to anticipate and counter any warehousing mishaps reported by end users.
Some of the most valuable insights about mesterolone’s practical applications come from customers at opposite ends of the volume spectrum. Pharmaceutical giants often involve us in their reformulation projects, seeking input on how minor differences in particle morphology or impurity spectrum could influence clinical trial outcomes. At the other end, startup research firms or university groups send us detailed technical questions and challenges unique to their scale and setup. These interactions push us to keep documentation current, update technical data packages regularly, and maintain a readiness to tweak process variables when new use cases emerge. The lab-to-plant feedback loop isn’t just a marketing catchphrase; it’s a fact of life in fine chemical manufacturing.
Every production batch we run shapes the future of mesterolone manufacture and distribution. We consistently monitor global best practices, looking for tweaks that yield higher yields, less waste, and safer operating conditions for our staff and end users. New environmental rules push us to refine solvent selection, adopt greener technologies, and maintain stricter waste tracking protocols. Input from clients on product recovery, solubility quirks, or seasonal supply challenges often spurs internal R&D initiatives, with a focus on delivering real performance benefits rather than just meeting basic specs.
Comparisons with materials sourced from regions with less mature regulatory environments always reinforce the value of a robust quality management system. Recalls, rejections, and price fluctuations underscore the cost—both in direct losses and reputation—of poor control anywhere in the process chain. Mesterolone users who have had negative experiences with other suppliers frequently cite inconsistent powder characteristics, unreliable documentation, and lack of compliance with pharmacopoeial requirements as decision factors for new partnerships. We believe high standards should require no excuses. Clear, reproducible quality wins every time.
Inside our plant, operators, QC chemists, and engineers meet frequently to review not just what goes right but what could have gone better in each run. Batch histories, deviation logs, and supply chain disruptions are living documents, pointed to often rather than tucked away. Those at the bench know which handlers can cause more dusting, which blending cycles need an extra sweep, and which packaging lines run best with which powder grade. This hard-won knowledge, rooted in years of hands-on production, shapes why our mesterolone consistently outperforms many generic alternatives—both on the test bench and in finished product manufacturing.
At the end of the day, a chemical manufacturer’s reputation grows or shrinks based on what end users report back weeks, months, or years later. Each kilogram of mesterolone shipped represents not just sales, but a part of someone’s health solution, a building block for a stable supply chain, and a contribution to countless scientific developments. We stay close to developments in both emerging therapies and legacy products, watching how regulatory shifts, client demand, or raw material market trends could affect both our production schedule and the broader availability of this vital API. Attention to feedback, practical testing, and open communication drive every improvement, iteration, and standard we set.