View Report
April 25, 2024
Measured Result
112.68 mg
112.68% of label claim
Stealth Labs
Stealth Labs
Latest Laboratory Result 112.68 mg April 25, 2024 · 112.68% of label claim View
Masteron Propionate 100 mg
Product Information Compound Details
Active Substance Drostanolone Propionate Short-acting DHT-derived ester
100 mg/mLStrength 100 mg/mL
Package 10 mL Vial 1,000 mg total labeled content
Form Oil-Based Injectable
Drug Class Androgen & Anabolic Steroid
Manufacturer Stealth Labs
Packaging Notice Shipped Without Product Label This Stealth Labs product is supplied in an unlabeled vial.
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U.S. Domestic
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Product Overview
Masteron Propionate 100 mg by Stealth Labs
Masteron Propionate 100 mg is an oil-based injectable containing drostanolone propionate manufactured by Stealth Labs and dosed at 100 mg/mL in a 10 mL vial.
Drostanolone Propionate Injectable
Masteron Propionate 100 mg is a short-acting anabolic-androgenic steroid containing drostanolone propionate, a dihydrotestosterone (DHT) derivative that does not aromatize to estrogen . Its rapid release profile and anti-estrogenic properties distinguish it from longer-acting preparations.
Drostanolone was historically developed for the treatment of breast cancer in women, utilizing its mild anti-estrogen properties . In bodybuilding and performance-enhancement settings, drostanolone propionate is commonly referenced for its hardening and cutting effects, particularly during pre-contest phases where a dry, lean physique is desired .
Drostanolone binds strongly to androgen receptors and exhibits anti-estrogenic activity, which can help reduce water retention and contribute to a harder, more vascular appearance in individuals with low body fat . When such compounds are used at supraphysiologic levels for physique enhancement, the potential for adverse effects increases and such use falls outside approved medical indications.
Key Benefits of Masteron Propionate 100 mg
- Short-acting propionate ester for rapid onset and clearance
- Does not aromatize to estrogen, reducing water retention risk
- Commonly referenced for muscle hardening and cutting phases
- 100 mg/mL concentration in a 10 mL vial
- Manufactured by Stealth Labs with published laboratory verification
Formulation
Oil-Based Injectable
Masteron Propionate 100 mg is presented as an oil-based injectable formulation. The specific carrier oil is not identified in the available product information.
Product Profile
Drostanolone Propionate Profile
Drostanolone propionate is a short-acting DHT-derived anabolic ester designed for rapid release after administration, with a pharmacokinetic profile that requires more frequent dosing than longer-acting preparations.
Short-Acting DHT-Derived Ester
The propionate ester provides a shorter half-life of approximately 1–3 days, requiring administration every other day or daily . This contrasts with drostanolone enanthate, which has a half-life of approximately 8 days and allows for less frequent injections .
Drostanolone is a DHT derivative that does not aromatize to estrogen, meaning it does not contribute to water retention or gynecomastia through estrogenic pathways . It also exhibits anti-estrogenic activity at the androgen receptor level, which can help reduce or eliminate the need for aromatase inhibitors when stacked with testosterone .
These characteristics explain why drostanolone propionate is encountered in non-medical bodybuilding settings where a hardening compound with anti-estrogenic properties is commonly preferred, particularly during cutting phases .
Release Profile
Rapid Onset, Short Duration
Drostanolone propionate has a half-life of approximately 1–3 days, requiring administration every other day or daily . This is significantly shorter than drostanolone enanthate (approximately 8 days) but similar to testosterone propionate. The shorter ester provides faster onset and clearance but requires more frequent injections.
Masteron Propionate 100 mg vs Other Stealth Labs Preparations
Stealth Labs offers Masteron Enanthate as a longer-acting alternative to drostanolone propionate. The enanthate ester is typically administered once or twice weekly, providing slower release and less frequent injections but making side effects harder to manage if they occur .
Compared to other compounds commonly referenced in cutting contexts, drostanolone propionate is often compared to Trenbolone Acetate. Both are short-acting and commonly used in cutting phases, though trenbolone is generally considered more potent and associated with a more pronounced side effect profile . Drostanolone does not aromatize, while trenbolone also does not aromatize but has progestogenic activity.
Laboratory Testing
Masteron Propionate 100 mg Lab Reports
Published laboratory reports for Masteron Propionate 100 mg are shown below with the test date, measured concentration and percentage of the product's 100 mg/mL label claim.
View Report
Laboratory results apply to the specific tested sample represented in each published report and should not be interpreted as a measurement of every vial or production batch.
Dosage & Usage
Masteron Propionate 100 mg Dosage & Usage
The information below is provided for educational reference only. Drostanolone is a Schedule III controlled substance in the US and is not approved for human use . Non-medical use falls outside approved indications.
Typical Dosage Ranges
In non-medical bodybuilding settings, drostanolone propionate such as Masteron Propionate 100 mg is commonly referenced in the range of 50–100 mg every other day (approximately 200–400 mg per week) . Beginners are typically referenced at 50 mg every other day, intermediate users at 75–100 mg every other day, and advanced users may reference higher doses, though side effect risk increases with dose .
| Use Case | Common Reference Range | Injection Frequency |
|---|---|---|
| Beginner (non-medical) | 50 mg per injection (200 mg / week) | Every other day |
| Intermediate (non-medical) | 75–100 mg per injection (300–400 mg / week) | Every other day |
| Advanced (non-medical) | 100 mg per injection (400–500 mg / week) | Daily or every other day |
Stacking & Cycle Considerations
In non-medical bodybuilding contexts, drostanolone propionate is commonly stacked with testosterone, typically at a 1:1 or 2:1 testosterone-to-drostanolone ratio . The anti-estrogenic properties of drostanolone may reduce or eliminate the need for aromatase inhibitors when running moderate testosterone doses (300–500 mg/week) . Stealth Labs offers Testosterone Propionate or Testosterone Enanthate as base compounds.
Because of the short-acting propionate ester, drostanolone propionate is often referenced in shorter cycles of 6–8 weeks, or in the final weeks of a longer cycle where rapid clearance is preferred . Cycle duration and structure should be considered carefully given the androgenic side effect profile.
Managing Side Effects
Drostanolone is associated with hair loss in genetically predisposed individuals due to its DHT-derived structure . It can also cause acne, increased aggression, and adverse lipid changes, particularly suppression of HDL cholesterol . Cardiovascular monitoring and lipid assessment are important during use.
Unlike aromatizing compounds, drostanolone does not cause water retention or gynecomastia through estrogenic pathways . However, it strongly suppresses natural testosterone production, and running it without a testosterone base can lead to libido and mood issues . Aromatase inhibitors such as Arimidex may be referenced for managing estrogen-related effects from the testosterone component.
Post-Cycle Therapy (PCT)
After completing a cycle with Masteron Propionate 100 mg, post-cycle therapy is commonly recommended in non-medical contexts to help restore endogenous testosterone production. Because of the short propionate ester, PCT should begin approximately 3–5 days after the last injection, allowing for faster clearance than longer-acting esters . Agents such as Clomid or Tamoxifen are commonly referenced for this purpose.
PCT protocols vary based on cycle length, compounds used and individual factors. A typical protocol referenced in bodybuilding contexts includes Clomid 50/50/25/25 or Nolvadex 40/40/20/20 over 4 weeks . Bloodwork and, where possible, medical guidance can help inform recovery strategy.
Important
Individual Response Varies
Dosing strategies, support compounds and recovery protocols should be adjusted based on experience level and bloodwork where possible. The information above is for educational reference and does not constitute medical advice.
Safety & Information
Drostanolone Propionate Safety Information
Drostanolone propionate is a Schedule III controlled substance in the US and is not approved for human use . It can affect cardiovascular, endocrine, and hepatic function. Non-medical use carries significant health risks.
Important Safety Information
Drostanolone was historically used in specific clinical settings for breast cancer treatment, but it has fallen out of favor in the medical community due to the availability of safer alternatives . It is not approved for human use today and is classified as a controlled substance in many countries .
Anabolic steroids suppress the body’s own testosterone production and can affect fertility and endogenous hormone balance. Drostanolone has been associated with significant androgenic effects including hair loss in susceptible individuals.
Important
Non-Medical Use
Higher-than-physiologic exposure to anabolic steroids can carry additional health risks. Product concentration and laboratory verification do not establish that non-medical use is safe or appropriate for an individual. Drostanolone is a controlled substance and obtaining it without a prescription is illegal.
Potential Adverse Effects
Drostanolone is associated with hair loss in genetically predisposed individuals due to its DHT-derived structure . It can accelerate androgenic alopecia, and oral 5-alpha reductase inhibitors may not fully mitigate this effect .
Adverse lipid changes are a significant concern, including suppression of HDL cholesterol . Cardiovascular strain and possible prostate issues are also associated with drostanolone use . A case report has documented central serous chorioretinopathy in a bodybuilder using drostanolone among other compounds .
Other potential effects include acne, increased aggression, and suppression of natural testosterone production . Drostanolone is not 17-alpha-alkylated, so it is not liver-toxic by that mechanism .
Conditions Requiring Medical Evaluation
Drostanolone use is contraindicated in individuals with active or remitted prostate cancer, pre-existing prostate hypertrophy with urinary obstruction, untreated hypertension, and untreated dyslipidemia . Individuals with aggressive androgenic alopecia should also consider the risk of accelerated hair loss.
Existing cardiovascular disease, abnormal lipid profiles, and other medical conditions should be discussed with a qualified healthcare professional before any consideration of use.
Monitoring During Use
Lipid values, particularly HDL cholesterol, should be monitored during drostanolone use . Prostate health monitoring, including PSA levels in men over 40, is recommended . Blood pressure and hematocrit should also be assessed periodically.
Laboratory testing of the product itself is separate from clinical monitoring of the person using the product. Product testing does not assess individual health status or suitability for use.
Product Care
Storage & Handling
Keep the vial securely stored and protected from conditions that could compromise the product. Inspect the vial and solution before use and do not use a product that appears damaged, contaminated or otherwise abnormal.
Keep all medications and injectable products out of the reach of children.
Shipping & Authenticity
Shipping & Product Authenticity
Masteron Propionate 100 mg is supplied through the official Stealth Labs 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 Stealth Labs 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 Masteron Propionate 100 mg product, use the security code on the vial label and cross-check it on the Stealth Labs official site. Official Stealth Labs presentation, batch-linked lab proof, 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
Masteron Propionate 100 mg Storage
Proper storage conditions help preserve formulation stability and overall product integrity throughout shelf life.
Recommended Conditions
Store at controlled room temperature (15–25°C) and protect from excessive heat, moisture, and direct light. Maintaining stable conditions helps preserve the integrity of the oily 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 at 15–25°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
Masteron Propionate 100 mg FAQ
Answers to common questions about Masteron Propionate 100 mg, drostanolone propionate, release characteristics, product strength and laboratory testing.
What is Masteron Propionate 100 mg used for?
Masteron Propionate 100 mg contains drostanolone propionate, a DHT-derived anabolic steroid. In non-medical bodybuilding settings it is commonly referenced for muscle hardening, fat loss, and pre-contest preparation, though such use falls outside approved medical indications and it is a controlled substance .
How often should Masteron Propionate 100 mg be injected?
Because of its short-acting propionate ester with a half-life of approximately 1–3 days, Masteron Propionate 100 mg is typically referenced as being administered every other day or daily . This is more frequent than the enanthate version, which can be injected once or twice weekly .
Does Masteron Propionate 100 mg require PCT?
In non-medical bodybuilding contexts, post-cycle therapy is commonly recommended after a drostanolone cycle to help restore endogenous testosterone production. Drostanolone strongly suppresses natural testosterone, so PCT is considered essential . Because of the short propionate ester, PCT should begin approximately 3–5 days after the last injection. Agents such as Clomid or Tamoxifen are commonly referenced for this purpose.
What does drostanolone propionate do?
Drostanolone propionate is a DHT-derived anabolic steroid that binds strongly to androgen receptors and does not aromatize to estrogen . It exhibits anti-estrogenic activity, which can reduce water retention and contribute to a harder, drier appearance in individuals with low body fat .
How long does drostanolone propionate take to work?
Drostanolone propionate has a rapid onset due to its short propionate ester . Effects on muscle hardness and vascularity are typically most apparent in individuals with low body fat, and visible changes become more pronounced after several weeks of consistent use .
Is drostanolone the best hardening compound?
There is no single compound that is universally best. Drostanolone has a distinct profile compared to other compounds, with strong anti-estrogenic activity and no aromatization . The appropriate choice depends on the circumstances and individual factors, and non-medical use falls outside approved indications.
What is the difference between Masteron Propionate and Masteron Enanthate?
The primary difference is the ester and resulting release profile. Masteron Propionate has a half-life of 1–3 days and requires more frequent injections, while Masteron Enanthate has a half-life of approximately 8 days and can be administered once or twice weekly . The propionate version provides faster onset and clearance, while the enanthate version offers more stable blood levels .
What is the difference between Masteron Propionate and Trenbolone Acetate?
Both drostanolone propionate and Trenbolone Acetate are short-acting compounds commonly referenced in cutting phases. Drostanolone is generally considered milder and provides anti-estrogenic effects, while trenbolone is more potent and associated with a more pronounced side effect profile . Drostanolone does not aromatize, while trenbolone also does not aromatize but has progestogenic activity.
Is 100 mg of Masteron Propionate a lot?
A milligram amount cannot be classified as appropriate or excessive without considering the medical indication, individual response, and other factors. It is also important to distinguish a dose in milligrams from a product’s concentration in mg/mL. Masteron Propionate 100 mg is labeled at 100 mg/mL; that concentration does not by itself specify how much should be administered.
What strength is Masteron Propionate 100 mg?
Masteron Propionate 100 mg is labeled at 100 mg of drostanolone propionate per mL. It is supplied in a 10 mL vial, giving 1,000 mg of total labeled drostanolone propionate content per vial.
Is Masteron Propionate 100 mg lab tested?
Yes. A published laboratory report dated April 25, 2024 measured Masteron Propionate 100 mg at 112.68 mg, equivalent to 112.68% of its 100 mg/mL label claim. The complete report can be viewed in the Lab Reports tab. Laboratory results apply to the tested sample represented by the individual report.
Can Masteron Propionate 100 mg be stacked with other compounds?
In non-medical bodybuilding contexts, drostanolone propionate is commonly stacked with testosterone at a 1:1 or 2:1 ratio . Its anti-estrogenic properties may reduce the need for aromatase inhibitors when running moderate testosterone doses . Stealth Labs offers Testosterone Propionate or Testosterone Enanthate as base compounds. Stacking decisions should consider individual experience and health status.
Related Offers
Lab Tested
Stealth Labs
Product Information Compound Details
Active Substance Trenbolone Enanthate Long-acting anabolic ester
200 mg/mLStrength 200 mg/mL
Package 10 mL Vial 2,000 mg total labeled content
Form Oil-Based Injectable
Drug Class Androgen & Anabolic Steroid
Manufacturer Stealth Labs
Packaging Notice Shipped Without Product Label This Stealth Labs product is supplied in an unlabeled vial.
Lab Tested
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Product Information Compound Details
Active Substance Methenolone Enanthate Long-acting DHT-derived ester
200 mg/mLStrength 200 mg/mL
Package 10 mL Vial 2,000 mg total labeled content
Form Oil-Based Injectable
Drug Class Androgen & Anabolic Steroid
Manufacturer Stealth Labs
Packaging Notice Shipped Without Product Label This Stealth Labs product is supplied in an unlabeled vial.
Lab Tested
Stealth Labs
Product Information Compound Details
Active Substance Drostanolone Enanthate Long-acting DHT-derived ester
200 mg/mLStrength 200 mg/mL
Package 10 mL Vial 2,000 mg total labeled content
Form Oil-Based Injectable
Drug Class Androgen & Anabolic Steroid
Manufacturer Stealth Labs
Packaging Notice Shipped Without Product Label This Stealth Labs product is supplied in an unlabeled vial.
Lab Tested
Stealth Labs
Product Information Compound Details
Active Formula Cutting Blend
150 mg/mLTestosterone Propionate 50 mg
Drostanolone Propionate 50 mg
Trenbolone Acetate 50 mg
Total Strength 150 mg/mL
Package 10 mL Vial 1,500 mg total labeled content
Form Oil-Based Injectable
Formula 3-Compound Cutting Blend
Drug Class Androgen & Anabolic Steroid
Manufacturer Stealth Labs
Packaging Notice Shipped Without Product Label This Stealth Labs product is supplied in an unlabeled vial.
Lab Tested
Stealth Labs
Product Information Compound Details
Active Substance Trenbolone Acetate Short-acting anabolic ester
100 mg/mLStrength 100 mg/mL
Package 10 mL Vial 1,000 mg total labeled content
Form Oil-Based Injectable
Drug Class Androgen & Anabolic Steroid
Manufacturer Stealth Labs
Packaging Notice Shipped Without Product Label This Stealth Labs product is supplied in an unlabeled vial.
Lab Tested
Stealth Labs
Product Information Compound Details
Active Substance Nandrolone Phenylpropionate Short-acting nandrolone ester
150 mg/mLStrength 150 mg/mL
Package 10 mL Vial 1,500 mg total labeled content
Form Oil-Based Injectable
Drug Class Androgen & Anabolic Steroid
Manufacturer Stealth Labs
Packaging Notice Shipped Without Product Label This Stealth Labs product is supplied in an unlabeled vial.
Stealth Labs
Product Information Compound Details
Active Substance Nandrolone Decanoate Long-acting anabolic ester
300 mg/mLStrength 300 mg/mL
Package 10 mL Vial 3,000 mg total labeled content
Form Oil-Based Injectable
Drug Class Androgen & Anabolic Steroid
Manufacturer Stealth Labs
Packaging Notice Shipped Without Product Label This Stealth Labs product is supplied in an unlabeled vial.
Lab Tested
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Product Information Compound Details
Active Substance Boldenone Undecylenate Long-acting anabolic ester
300 mg/mLStrength 300 mg/mL
Package 10 mL Vial 3,000 mg total labeled content
Form Oil-Based Injectable
Drug Class Androgen & Anabolic Steroid
Manufacturer Stealth Labs
Packaging Notice Shipped Without Product Label This Stealth Labs product is supplied in an unlabeled vial.