Description

Technical Parameters

Introduction

ProvironMesterolone2

musclepic 3

Products Description

Part 1: Classification by Intended Use and Market Positioning

For ease of product management and target customer positioning, STROMUSC Proviron 25mg Tablets can be categorized as follows:

1. Clinical/Pharmaceutical Grade

Targeted at hospitals and regulated prescription markets, raw materials and tablet production comply with GMP/pharmacopoeial standards. Suitable for use in confirmed male androgen deficiency or as an adjunct therapy in reproductive medicine. Packaging, excipients, and quality control adhere to pharmacopoeial specifications.

2. Research/Analytical Grade

Specialized for use in pharmacokinetic, pharmacodynamic, or formulation development studies, with an emphasis on batch-to-batch consistency and traceable analytical data. Not intended for clinical administration.

3. Educational/Supplementary Information

This category is not intended to expand prescription channels; rather, it provides the fitness community with information on pharmacology, risk warnings, and legal and compliant use. It encourages medical supervision when making any hormone therapy decisions.

Part 2 Advantages and pharmacological characteristics (why it was chosen)

1. Non-aromatization (not converted to estrogen) - does not directly cause estrogen-related side effects such as water retention or gynecomastia, so it has advantages in scenarios where it is necessary to maintain a "dry and hard" body shape or avoid edema. ([Wikipedia][1])

2. Potential effect of increasing free testosterone - Mesterolone has a high affinity for sex hormone binding globulin (SHBG), and theoretically can replace a portion of bound testosterone, increase the proportion of free testosterone in plasma, and thus improve sexual function and libido. ([Wikipedia][1])

3. Oral administration without 17α-alkylation - its C1α methyl substitution structure confers certain oral activity, but it is not a typical 17α-alkyl structure, so the risk of hepatotoxicity is generally lower than that of most 17α-alkylated oral androgens. ([Science Express][2])

4. Little effect on muscle edema and a "tighter" appearance of the body - Since it is not aromatized, users often see clearer muscle lines (this is the result of the pharmacological properties in terms of physical fitness).

5. Rich history and clinical experience as an adjuvant therapy - Proviron has been clinically used since the 1960s and has a relatively mature prescription experience. ([Wikipedia][1])

Part 3 Physicochemical Properties (Important Parameters and Properties)

1. Chemical Identity and Basic Data: The molecular formula of Mesterolone is usually recorded as C20H32O2, the molecular weight is approximately 304.47, and the CAS number is 1424-00-6. This substance is a C1α methyl derivative of DHT (1α-methyl-DHT). These are the basic reference data for identification and quality testing. ([PubChem][3])

2. Appearance and properties: The raw material is a white or off-white crystalline powder; after formulation and coating, the oral tablets appear as uniform solid flakes.

3. Solubility: Mesterolone is poorly soluble in water but readily soluble in organic solvents (such as ethanol, methanol, and other commonly used organic solvents for extraction). In pharmaceutical formulation, disintegration and dissolution properties are often improved by coating and excipients. ([PubChem][3])

4. Stability: The chemical stability is good under dry, room temperature, and dark conditions, but tablets need to be kept under controlled humidity and high temperature to avoid degradation or deterioration of disintegration properties.

5. Pharmacokinetics and physical and chemical explanations: Its C1α methyl group allows the molecule to escape some first-pass metabolism, thus having a certain degree of oral activity (although the bioavailability is not high). ([Wikipedia][1])

Part 4 Color, appearance and pharmaceutical description (for 25mg tablets)

The appearance design of STROMUSC brand Proviron 25mg tablets usually follows the following points (the actual design is subject to the production batch):

1. Tablet color: Commonly white, slightly ivory white or light yellow. If coated, the color can be adjusted to light gray, light yellow or brand color for easy identification.

2. Shape and labeling: Tablets are usually round or oval tablets with a smooth surface and engraved with "25" or brand characteristic marks to facilitate segmentation and visual inspection of quality.

3. Disintegration and dissolution: To ensure bioavailability and consistency of administration, excipients such as cosolvents, starches or hydroxypropyl methylcellulose are selected in the formulation to control the disintegration timing and dissolution rate of the tablets.

4. Coating: To improve taste, reduce oxidation and facilitate swallowing, aqueous or film coating processes are often used. Routine quality inspections include hardness, disintegration time, and content uniformity testing. (Note: The specific formula is proprietary to the manufacturer)

Part 5 Pharmacokinetics (Absorption, Distribution, Metabolism, Excretion)

1. Absorption and Peak Concentration: Mesterolone can be absorbed after oral administration and reaches peak concentration within a short period of time. Some pharmacokinetic studies have shown that Tmax is in the range of 1–2 hours.

2. Terminal Half-Life: The reported terminal half-life is approximately 12–13 hours, which falls within the category of short- to medium-term oral androgens. ([NPS][4])

3. Protein Binding: The plasma protein binding rate is high (approximately 98%), and its affinity for SHBG is significantly higher than that for DHT (in some studies, it has been shown to preferentially bind to SHBG), which explains its indirect effect of replacing bound testosterone and increasing free testosterone. ([Wikipedia][1])

4. Metabolism and excretion: Metabolized primarily in the liver, with the final product excreted in the urine as a glucuronide or sulfate conjugate; most doses are excreted within a few days as metabolites. ([NPS][4])

Part 6 Clinical indications and common uses (including an overview of non-medical uses)

1. Official/clinical uses: Traditionally used to treat male androgen deficiency (hypogonadism), certain types of male infertility (as an adjuvant), and in a few countries for indications such as delayed puberty. Many official products require a prescription and are administered at the discretion of the physician in clinical practice. ([Wikipedia][1], [bayer.com][5])

2. Non-clinical/adjuvant uses: In bodybuilding and hormone optimization circles, Mesterolone is used to improve libido, increase "hardness," or as an adjuvant in hormone replacement therapy. However, it should be emphasized that any non-prescription or unmonitored use carries legal and health risks. ([Wikipedia][1])

3. Common dosage reference (for medical literature citation only): The dosage used in research or historical clinical use in the literature is usually divided daily, with the total amount ranging from tens of milligrams to hundreds of milligrams per day. The specific dosage should be based on the doctor's instructions or pharmacopoeia. ([Wikipedia][1], [bayer.com][5])

Part 7 Adverse Reactions and Safety Tips (Key Risk Points)

1. Androgenic side effects: including acne, increased body hair, male pattern baldness (higher risk in those with genetic predisposition), vocal cord changes (especially sensitive in women), changes in libido, etc. ([Wikipedia][1])

2. Effects on the liver: Compared with typical 17α-alkylated oral androgens, Mesterolone is not 17α-alkylated. Traditionally, it is believed that its hepatotoxicity risk is lower, but attention should still be paid to the liver metabolic load - liver function should be monitored when used long-term or in combination with other liver-metabolizing drugs. Academic reviews emphasize that oral androgens can still cause stress on the liver, and individual differences are significant. ([Science Express][2], [PubMed][6])

3. Cardiometabolic risk: Long-term or high-dose use of androgen drugs may adversely affect the lipid profile (e.g., lowering HDL and increasing LDL), thereby increasing the risk of cardiovascular disease. During use, attention should be paid to lipid and blood pressure indicators. ([Wikipedia][1])

4. Reproductive axis effects: Long-term use of exogenous androgens can feedback inhibit the hypothalamic-pituitary-testicular axis (HPT axis), leading to decreased endogenous testosterone secretion, testicular atrophy, or impaired fertility; the effects of medication on fertility plans should be evaluated and monitored during clinical use. ([Wikipedia][1])

5. Drug interactions and contraindications: Caution should be exercised when used in combination with strong CYP enzyme inhibitors/inducers, anticoagulants, or other hormonal drugs; patients with liver dysfunction, prostate disease, or minors are generally contraindicated or require strict evaluation. ([bayer.com][5])

Part 8 Quality Control, Identification Methods and Key Test Items

Regularly produced 25mg tablets and raw material powders should be confirmed for quality by the following analyses: appearance, content uniformity, dissolution profile, impurity profile (HPLC/UPLC), infrared/mass spectrometry/nuclear magnetic resonance (IR/MS/NMR) identification, residual solvent testing, heavy metal and microbial limits, etc. Batch release should be based on complete COA (Certificate of Analysis) and stability data.

Part 9 Packaging, Storage and Labeling (STROMUSC Product Practice Recommendations)

1. Packaging: Aluminum-plastic blister or aluminum foil bottle, most commonly 10/20/30 tablets/box; the outer packaging should be marked with the drug name, dosage, batch number, expiration date, manufacturer and instructions. Regular OTC/prescription drugs should have anti-counterfeiting and traceability codes. The instructions of manufacturers such as Bayer also have standard examples for the packaging and patient information of Proviron 25mg. ([bayer.com][5])

2. Storage conditions: Store in a dry place at room temperature, away from light, and avoid high temperature and humidity. Keep out of reach of children. After opening, storage should follow the instructions in the package insert or manufacturer's instructions.

Part 10 Legal, ethical and compliance tips

Mesterolone has different legal status in different countries/regions: in most countries, it is regulated by drug regulatory authorities as a prescription hormone drug; in some jurisdictions, it is also listed as a controlled substance or a substance banned in competition (regulated by the Sports Anti-Doping Organization). Individuals should check the anti-doping regulations of local laws and sports organizations before using or purchasing. Any use for competitive or non-prescription purposes may bring legal or professional risks. ([Wikipedia][1])

Part 11 Frequently Asked Questions about STROMUSC brand tablets (FAQ style)

1. Why is the dose of STROMUSC 25mg tablets chosen? --25mg is a common specification for easy dosing and dose adjustment, which can meet the clinical needs of oral administration in divided doses and also facilitate patients to reduce/split the dose as needed.

2. Does medication monitoring require ongoing treatment? - Baseline endocrine, liver function, lipid profile, and blood pressure tests are recommended before and during treatment, with regular follow-up.

3. Can women take this medication? - Mesterolone is an androgen, and its use in women carries a higher risk (possibly virilizing effects). It is generally not recommended for women except for short-term use under strict medical supervision for specific indications.

4. Can it cause cancer or severe liver damage? - Compared to 17α-alkylated oral androgens, there is less evidence of hepatotoxicity with mesterolone. However, any long-term or high-dose androgen intervention may still increase hepatic and cardiovascular risks and should be carefully monitored. ([Science Express][2], [PubMed][6])

Part 12 Conclusion and Recommendations (for R&D, clinical practice, and end users)

STROMUSC brand Proviron (Mesterolone) 25mg tablets are known for their non-aromatization, potential to increase free testosterone, and convenient oral administration. They are suitable for use as prescription medications for certain male androgen deficiency or reproductive medicine assistance settings. However, as an androgen drug, any use should be conducted under a compliant medical system and strictly follow quality control and safety monitoring guidelines. For product managers and marketers, emphasizing compliant packaging, clear instructions, and use risk warnings are key to building brand reputation and protecting user health.