British Dragon
British Dragon
Mastabol 100 mg
Product Information Compound Details
Active Substance Drostanolone Propionate Short-Acting DHT-Derived Anabolic-Androgenic Steroid
100 mg/mLStrength 100 mg/mL
Package 10 mL Vial 1,000 mg Total Labeled Content
Form Oil-Based Injectable
Drug Class Anabolic-Androgenic Steroid
Estimated Half-Life Approximately 2–3 Days
Manufacturer British Dragon
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Product Overview
Mastabol 100 mg by British Dragon
Mastabol 100 mg is an oil-based injectable containing Drostanolone Propionate, manufactured by British Dragon and dosed at 100 mg/mL in a 10 mL vial.
Drostanolone Propionate Injectable
Mastabol 100 mg contains drostanolone propionate, a synthetic anabolic-androgenic steroid derived from dihydrotestosterone (DHT). It is structurally modified by the addition of a methyl group at the carbon-2 alpha position, which significantly increases its anabolic strength and protects it from metabolic breakdown by the 3-hydroxysteroid dehydrogenase enzyme in skeletal muscle tissue. The propionate ester is attached to the 17-beta hydroxyl group, slowing absorption from the injection site and prolonging its therapeutic window.
Drostanolone propionate was originally developed for clinical use in oncology. It has been used for the palliation of androgen-responsive recurrent mammary cancer in postmenopausal women. A clinical trial compared drostanolone propionate (Masteril) and nandrolone decanoate in the treatment of breast carcinoma. Its therapeutic application in medicine remains limited, and it is not approved for human performance enhancement.
In non-medical bodybuilding contexts, drostanolone propionate is commonly referenced for its non-aromatizing properties and its ability to promote muscle hardness and vascularity, particularly during cutting phases. Because it is derived from DHT, it does not convert to estrogen, meaning it does not cause water retention or gynecomastia. It is one of the most frequently detected anabolic androgenic steroids in doping control analysis. Such use falls outside approved indications.
Key Properties of Mastabol 100 mg
- DHT-derived anabolic steroid with anti-estrogenic properties
- Non-aromatizing: does not convert to estrogen, avoiding water retention
- Short-acting propionate ester for rapid onset and clearance
- Commonly referenced for muscle hardness and vascularity in cutting phases
- 10 mL vial provides 1,000 mg total labeled content
Carrier Oil
MCT Oil Formulation
Mastabol 100 mg uses MCT oil as its carrier oil, providing the oil base for the drostanolone propionate formulation. MCT oil is a commonly used carrier for injectable anabolic preparations, selected for its low viscosity and compatibility with esterified compounds.
Product Profile
Drostanolone Propionate Profile
Drostanolone propionate is a short-acting, non-aromatizing anabolic steroid derived from dihydrotestosterone, commonly referenced for its effects on muscle hardness and vascularity.
Short-Acting DHT-Derived Ester
Drostanolone propionate is a modified form of dihydrotestosterone (DHT), featuring a methyl group at the carbon-2 alpha position. This structural modification enhances the steroid's anabolic properties and provides resistance to metabolic breakdown by the 3-hydroxysteroid dehydrogenase enzyme found in skeletal muscle. The propionate ester attached to the 17-beta hydroxyl group makes the molecule more lipophilic than free drostanolone, leading to slower absorption from the injection site and a prolonged therapeutic window.
The half-life of drostanolone propionate is approximately two to three days following intramuscular injection. This short half-life supports frequent administration, typically every other day, to maintain stable blood levels.
As a DHT derivative, drostanolone propionate does not aromatize to estrogen. It also exhibits anti-estrogenic properties, which made it a therapeutic option for estrogen receptor-positive breast cancer in postmenopausal women. This anti-estrogenic activity is one reason it is commonly referenced in non-medical cutting contexts.
Release Profile
Fast Onset, Short Duration
The propionate ester produces a fast release profile, with effects beginning shortly after injection and clearing within days. This contrasts with longer-acting esters such as Mastabol 200 (drostanolone enanthate). The short duration allows for rapid clearance before post-cycle therapy.
Mastabol 100 mg vs Other British Dragon Preparations
British Dragon offers several injectable compounds with different characteristics. Mastabol 200 contains drostanolone enanthate, a longer-acting ester requiring less frequent injections. Trenabol 100 contains trenbolone acetate, another short-acting 19-nor compound with a much harsher side effect profile. Testabol Propionate contains testosterone propionate, a short-acting aromatizing compound.
Mastabol 100's distinguishing characteristic among these compounds is its DHT-derived, non-aromatizing nature combined with its short propionate ester, making it a commonly referenced option for cutting phases where a dry, hard look is the goal.
Dosage & Usage
Mastabol 100 mg Dosage & Usage
The information below is provided for educational reference only. Drostanolone propionate is a controlled substance and is not approved for human performance enhancement. Non-medical use falls outside approved indications.
Typical Dosage Ranges
In non-medical bodybuilding contexts, drostanolone propionate is commonly referenced in the range of 300 to 600 mg per week, divided into injections administered every other day. A forum discussion describes a cycle using 200 mg in weeks 1–3, increasing to 300 mg in weeks 4–7, and returning to 200 mg in week 8. Another forum comment notes that "Masteron pra homens no mínimo 300mg/sem" (for men, a minimum of 300 mg/week).
| Use Case | Common Reference Range | Injection Frequency |
|---|---|---|
| Conservative non-medical (reported) | 300 mg/week | Every other day |
| Standard non-medical (reported) | 400–500 mg/week | Every other day |
| Higher-dose non-medical (reported) | 600 mg/week | Every other day |
These non-medical ranges represent community-reported practices and are not derived from controlled clinical trials for performance enhancement. Cycle duration in non-medical contexts is typically referenced at 6–12 weeks.
Stacking & Cycle Considerations
In non-medical bodybuilding contexts, drostanolone propionate is commonly stacked with a testosterone base, such as Testabol Propionate or Testabol Depot. It is also frequently referenced alongside Trenabol 100 or Stanabol 10 for cutting cycles.
Because drostanolone propionate does not aromatize, it does not require aromatase inhibitors for estrogen management. However, it suppresses endogenous testosterone production, so post-cycle therapy may be referenced after use.
Managing Side Effects
Drostanolone propionate is associated with several side effects. Androgenic effects such as acne, oily skin, and hair loss are common in predisposed individuals. Cardiovascular concerns include increased blood pressure and potential ventricular hypertrophy with long-term use. Suppression of endogenous testosterone production occurs, which may lead to sexual dysfunction and mood changes.
A documented case report describes a 19-year-old male who developed severe cholestatic hepatitis after using a combination of stanozolol, methenolone enanthate, and drostanolone propionate (200 mg every 96 hours) for 56 days. He presented with jaundice and a bilirubin of 41.9 mg/dl. The case highlights the potential for hepatotoxicity with anabolic steroid use.
Post-Cycle Therapy (PCT)
Drostanolone propionate suppresses endogenous testosterone production. Because of the short propionate ester, PCT can begin shortly after the final injection, typically within a few days. Agents such as Clomiphene or Tamoxifen are commonly referenced for this purpose.
Important
Individual Response Varies
Drostanolone propionate has no approved human use for performance enhancement. Any information about non-medical use is derived from user-reported practices and is not validated by controlled clinical research. This information does not constitute medical advice.
Safety & Information
Drostanolone Propionate Safety Information
Drostanolone propionate is a controlled anabolic steroid with significant cardiovascular, hepatic, and endocrine risks. It is not approved for athletic performance enhancement.
Important Safety Information
Drostanolone propionate is a synthetic anabolic-androgenic steroid. It is not approved for human performance enhancement, and its use for such purposes falls outside approved indications. The compound is prohibited by WADA, and drostanolone is one of the most frequently detected anabolic androgenic steroids in doping control analysis.
A case report documented severe cholestatic hepatitis in a young male using a combination of anabolic steroids including drostanolone propionate. This highlights the potential for serious hepatotoxic reactions.
Important
Non-Medical Use
Non-medical use of drostanolone propionate falls outside approved indications. Product purity does not establish that non-medical use is safe or appropriate for an individual.
Potential Adverse Effects
Androgenic side effects include virilization (masculine traits in women), acne, oily skin, and hair loss in predisposed individuals. Cardiovascular concerns include increased blood pressure and potential ventricular hypertrophy with long-term use.
Drostanolone propionate suppresses endogenous testosterone production, which may lead to sexual dysfunction and mood changes, including increased aggression.
Fluid retention and hypercalcemia have been noted as potential side effects.
Conditions Requiring Medical Evaluation
Anabolic steroids such as drostanolone propionate should be avoided by individuals with pre-existing cardiovascular disease, hepatic impairment, or a history of hormone-sensitive cancers. Women who are pregnant or may become pregnant should avoid exposure to androgens.
Monitoring During Therapy
Because drostanolone propionate has no approved human use for performance enhancement, no standardized monitoring protocols exist for non-medical use. In community harm-reduction contexts, monitoring of blood pressure, lipid profile, and liver function is commonly referenced.
Product Care
Storage & Handling
Store in a dry, shaded area below 30°C. Protect from excessive heat, moisture, and direct light. Do not freeze. Inspect the vial and solution before use and do not use a product that appears damaged, contaminated, or otherwise abnormal. Keep out of reach of children.
Further Safety Information
Shipping & Authenticity
Shipping & Product Authenticity
Mastabol 100 mg is supplied through the official British Dragon distribution chain and shipped in original manufacturer packaging with discreet, privacy-focused handling.
USA Domestic 3–5 business days
International 10–15 business days
Order Processing 24–48 business hours
Tracking Provided after dispatch
Direct Supply
Discreet Delivery & Original Packaging
The outer shipping package remains discreet, with privacy-focused handling and no unnecessary external product details. Products are supplied through the official British Dragon distribution chain.
What to Expect
- Orders are processed after payment confirmation
- USA Domestic shipping is typically faster when local stock is selected
- International orders include tracking, though update frequency may vary by destination
- Multiple warehouses may result in separate shipments when applicable
Authenticity Verification
To verify your Mastabol 100 mg product, use the security code on the vial label and cross-check it on the British Dragon official site. Official British Dragon presentation and original packaging help reinforce product legitimacy and buyer confidence.
For complete delivery details, tracking policy, and reshipment terms, please see our Shipping Info page.
Storage
Mastabol 100 mg Storage
Proper storage conditions help preserve formulation stability and overall product integrity throughout shelf life.
Recommended Conditions
Store in a dry, shaded area below 30°C. Protect from excessive heat, moisture, and direct light. Maintaining stable conditions helps preserve the integrity of the oil-based formulation.
Keep the vial in its original packaging until use. Do not freeze. Before administration, inspect the solution and avoid use if it appears cloudy, discolored, contains particulate matter, or if the vial or seal is compromised.
Keep out of reach of children. Follow proper handling and sterile injection practices when administering the product.
Quick Reference
Do & Don't
- Do store below 30°C
- Do keep in original packaging
- Do inspect before each use
- Don't freeze the vial
- Don't expose to direct sunlight
- Don't use if solution looks abnormal
Frequently Asked Questions
Mastabol 100 mg FAQ
Answers to common questions about Mastabol 100 mg, drostanolone propionate, release characteristics, product strength, and related topics.
What is Mastabol 100 mg used for?
Mastabol 100 mg contains drostanolone propionate, a DHT-derived anabolic steroid. It was historically used for palliation of androgen-responsive recurrent mammary cancer in postmenopausal women. In non-medical bodybuilding contexts, it is commonly referenced for muscle hardness and vascularity during cutting phases, though such use falls outside approved indications.
How often should Mastabol 100 mg be injected?
Due to the short propionate ester, drostanolone propionate has a half-life of approximately two to three days and is typically injected every other day. In non-medical contexts, weekly totals of 300–600 mg are commonly referenced.
Does Mastabol 100 mg require PCT?
Yes, drostanolone propionate suppresses endogenous testosterone production. Because of the short ester, PCT can begin shortly after the final injection, typically within a few days. Agents such as Clomiphene or Tamoxifen are commonly referenced for this purpose.
What does Drostanolone Propionate do?
Drostanolone binds to the androgen receptor, causing downstream genetic transcriptional changes that lead to retention of nitrogen, potassium, and phosphorus; increased protein anabolism; and decreased amino acid catabolism. It is a DHT derivative and does not convert to estrogen.
How long does Mastabol take to work?
The propionate ester has a half-life of approximately two to three days, allowing for relatively rapid onset of effects. In non-medical contexts, users commonly report noticeable effects on muscle hardness and vascularity within 1–2 weeks of starting use. Cycle duration is typically referenced at 6–12 weeks.
Is Mastabol the best cutting steroid?
There is no universally best cutting steroid. Drostanolone propionate's distinguishing characteristics include its non-aromatizing nature, anti-estrogenic properties, and its effects on muscle hardness and vascularity. However, it is often described in community discussions as a "weak" mass builder, with one forum comment noting "nao dá massa muscular" (does not give muscle mass).
What is the difference between Mastabol 100 and Mastabol 200?
Mastabol 100 contains drostanolone propionate, a short-acting ester requiring every-other-day injections. Mastabol 200 contains drostanolone enanthate, a longer-acting ester requiring less frequent injections. Both forms work similarly but differ in how long they stay active.
What is the difference between Mastabol 100 and Testabol Propionate?
Mastabol 100 contains drostanolone propionate, a DHT-derived, non-aromatizing steroid. Testabol Propionate contains testosterone propionate, which aromatizes to estrogen. Drostanolone is more commonly referenced for muscle hardness, while testosterone is a foundational compound for mass and strength.
Is 100 mg of Mastabol a lot?
Mastabol 100 mg is labeled at 100 mg of drostanolone propionate per mL. In non-medical contexts, weekly totals of 300–600 mg are commonly referenced, meaning multiple injections per week are typical. A single 100 mg injection is a standard unit dose in many reported protocols.
What strength is Mastabol 100 mg?
Mastabol 100 mg is labeled at 100 mg of drostanolone propionate per mL. It is supplied as an oil-based injectable in a 10 mL vial, giving 1,000 mg of total labeled content per vial, manufactured by British Dragon.
Is Mastabol 100 lab tested?
No lab reports were provided for this specific product listing. For products with published laboratory reports, those results would apply to the specific tested sample and should not be interpreted as a measurement of every vial or production batch.
Why is Mastabol associated with muscle hardness?
Drostanolone propionate is derived from DHT and does not convert to estrogen, which means it does not cause water retention. This lack of subcutaneous water makes muscles appear harder and more defined. Its anti-estrogenic properties also contribute to a drier, more vascular appearance.
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Product Information
Compound Details
Active Substance
Methandienone
Dianabol · 17α-Alkylated Oral Anabolic Steroid
10 / 20 / 50 mg
Strength
10, 20, or 50 mg/tablet
Package
100 Tablets
Form
Oral Tablets
Drug Class
Anabolic-Androgenic Steroid
Estimated Half-Life
Approximately 3–6 Hours
Manufacturer
British Dragon
Lab Tested
British Dragon Pharmaceuticals
Product Information Compound Details
Active Substance Testosterone Cypionate Long-acting testosterone ester
250 mg/mLStrength 250 mg/mL
Package 10 mL Vial 2,500 mg total labeled content
Form Oil-Based Injectable
Estimated Half-Life Approximately 8 Days
Drug Class Androgen & Anabolic Steroid
Manufacturer British Dragon
British Dragon Pharmaceuticals
Product Information Compound Details
Active Substance Testosterone Propionate Short-acting testosterone ester
100 mg/mLStrength 100 mg/mL
Package 10 mL Vial 1,000 mg total labeled content
Form Oil-Based Injectable
Estimated Half-Life Approximately 2–3 Days
Drug Class Androgen & Anabolic Steroid
Manufacturer British Dragon
British Dragon Pharmaceuticals
Product Information Compound Details
Active Substance Trenbolone Acetate Short-acting trenbolone ester
100 mg/mLStrength 100 mg/mL
Package 10 mL Vial 1,000 mg total labeled content
Form Oil-Based Injectable
Estimated Half-Life Approximately 1–2 Days
Drug Class Androgen & Anabolic Steroid
Manufacturer British Dragon