Methenolone Enanthate (Primobolan Depot)
Active Substance: Methenolone Enanthate
Description
What is Methenolone Enanthate (Primobolan Depot)?
Methenolone Enanthate, commonly known by its brand name Primobolan Depot, is an injectable anabolic-androgenic steroid (AAS). It is an ester of the steroid methenolone and is a derivative of dihydrotestosterone (DHT). While it was historically used for medical purposes, such as treating anemia caused by bone marrow failure, its use has been largely discontinued in medicine and it is now primarily found on the black market for performance and physique enhancement.
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Different Names: Methenolone Enanthate is also known as Metenolone Enanthate, Nibal Injection, and by its street name "Primo."
Side Effects and Benefits
Benefits:
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Mild Anabolic Effects: Primobolan is known for its relatively mild anabolic properties, which can lead to slow but steady gains in muscle mass.
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No Estrogenic Side Effects: As a DHT derivative, it does not aromatize into estrogen. This means users are not at risk of estrogenic side effects such as gynecomastia (development of male breast tissue), water retention, or high blood pressure caused by water retention.
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Low Liver Toxicity: Unlike some oral AAS, Primobolan Depot is not C17-alpha alkylated, meaning it is not associated with significant liver stress.
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Fat Loss: It may contribute to a leaner physique and aid in fat loss.
Side Effects:
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Androgenic Side Effects: Despite its mild nature, it can still cause androgenic side effects, especially in individuals with a genetic predisposition. These may include acne, oily skin, and male pattern baldness.
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Testosterone Suppression: Like all AAS, Primobolan will suppress the body's natural testosterone production. This can lead to a decrease in libido, fatigue, and other issues if not managed with proper post-cycle therapy (PCT).
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Virilization in Women: For female users, it can cause virilization, which includes the development of masculine characteristics such as a deepened voice, increased body hair, and clitoral enlargement.
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Negative Impact on Cholesterol: It can negatively impact cholesterol levels by increasing LDL (bad cholesterol) and decreasing HDL (good cholesterol), which increases the risk of cardiovascular disease.
Pros and Cons
Pros:
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No Estrogenic Side Effects: A key advantage for those who are sensitive to estrogen.
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Mild and "Clean" Gains: Promotes gradual, high-quality muscle gains with less water retention.
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Low Hepatotoxicity: Safer for the liver compared to many other oral steroids.
Cons:
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Testosterone Suppression: Requires post-cycle therapy to restore natural hormone levels.
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Androgenic Side Effects: Still carries a risk of androgenic side effects.
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High Cost and Counterfeiting: Because of its popularity and relatively mild nature, it is one of the most expensive and most counterfeited steroids on the black market.
Dosage and Frequency
Dosages for Primobolan Depot can vary significantly depending on the user's goals and experience level. There are no universally agreed-upon medical guidelines for its use in performance enhancement, but common dosages are as follows:
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Male Users: Typically range from 400 mg to 1,000 mg per week.
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Female Users: Typically use much lower doses, often in the range of 50 mg to 100 mg per week.
The frequency of injection is usually once or twice per week to maintain stable blood levels due to its long-acting enanthate ester.
Half-Life and Detection Time
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Half-Life: The elimination half-life of Methenolone Enanthate is approximately 10.5 days. This means it takes about 10.5 days for half of the drug to be eliminated from the body.
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Detection Time: Due to its long-acting nature, Primobolan Depot has a very long detection time. It can be detectable in drug tests for many months, often up to 4-5 weeks, or even longer depending on the specific test and individual metabolism.
Sterogenic, Progestogenic, and Prolactin Effects
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Estrogenic Effects: As a DHT derivative, Methenolone Enanthate does not aromatize into estrogen. Therefore, it has no estrogenic effects.
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Progestogenic Effects: Primobolan is not known to have any significant progestogenic activity.
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Prolactin Effects: It does not cause an increase in prolactin levels. In fact, some studies suggest that DHT-derived steroids may have an inhibitory effect on prolactin release.
Anabolic-Androgenic Ratio
The anabolic-androgenic ratio of Methenolone is approximately 88:44. This ratio indicates that it has a moderate anabolic rating and a relatively weak androgenic rating compared to testosterone (which has a ratio of 100:100). This is why it is often considered a "mild" steroid.
Pharmacological Properties
Half Life
5 days
Active Dose
70%
Detection
3.57 weeks
Concentration
250 mg/ml
Anabolic/Androgenic Profile
Usage Effectiveness
Activity Profile
Estrogenic
None
Progestanic
None
Water Retention
None
Aromatization
No
Benefits
Dosage Recommendations
Beginner
200-400 mg/week
Intermediate
400-600 mg/week
Advanced
600-800 mg/week
Evidence-based planning resources
Dive deeper into Methenolone Enanthate (Primobolan Depot) cycle design, stacking options, and harm-reduction checklists available inside Anabolic Planner.
- Methenolone Enanthate (Primobolan Depot) compound database overviewCompare Methenolone Enanthate (Primobolan Depot) with other steroid agents in the structured compound index.
- Methenolone Enanthate (Primobolan Depot) stack and cycle templatesReview evidence-based cycle outlines, dose progressions, and PCT pairings that incorporate Methenolone Enanthate (Primobolan Depot).
- Harm-reduction guide for Methenolone Enanthate (Primobolan Depot)Refresh safety monitoring, lab work, and countermeasure strategies tailored for Methenolone Enanthate (Primobolan Depot) protocols.
Peer-reviewed reference material
Validate mechanisms, contraindications, and regulatory guidance for Methenolone Enanthate (Primobolan Depot) with trusted clinical databases.
- Methenolone Enanthate clinical research on PubMedSearch peer-reviewed human and veterinary studies discussing efficacy, endocrine impact, and contraindications.
- Methenolone Enanthate pharmacology via Drug Information PortalReview mechanisms, synonyms, regulatory status, and toxicology summaries from the U.S. National Library of Medicine.
Side Effects
Common
Rare
Severe
Safety Information
Liver Toxicity
None
Kidney Toxicity
Low
Cardiovascular Risk
Moderate
Disclaimer: This information is for educational purposes only. Always consult with a qualified healthcare professional before using any compounds.