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  • Chemical Name: Methenolone enanthate
  • Synonyms: Methenolone heptanoate, Primo E
  • Molecular Formula: C₂₇H₄₂O₃
  • Molecular Weight: ~414.63 g/mol
  • CAS Number: 303-42-4

Methenolone Enanthate (Primobolan) Powder – Technical Specifications & Overview;

Methenolone Enanthate powder, widely recognized under the name Primobolan, is a long-acting ester of methenolone supplied as a high-purity crystalline raw material. This compound is valued in pharmaceutical and laboratory contexts for its stable structure and extended release characteristics when formulated.

As a derivative of dihydrotestosterone (DHT), Methenolone Enanthate does not undergo aromatization, which distinguishes it from many other anabolic compounds in research discussions. Its enanthate ester contributes to a prolonged half-life, enabling sustained activity over time in formulated applications.

Typically manufactured to a purity standard of ≥98% (HPLC), Methenolone Enanthate powder appears as a white to slightly yellow crystalline substance with good solubility in oils and organic solvents. It maintains stability when stored under controlled conditions, protected from light, heat, and moisture.


Chemical Identification

  • Chemical Name: Methenolone enanthate
  • Synonyms: Methenolone heptanoate, Primo E
  • Molecular Formula: C₂₇H₄₂O₃
  • Molecular Weight: ~414.63 g/mol
  • CAS Number: 303-42-4

Physical Characteristics

  • Appearance: White to slightly yellow crystalline powder
  • Solubility:
    • Freely soluble in oils (e.g., sesame oil, grapeseed oil)
    • Soluble in organic solvents such as ethanol
    • Insoluble in water
  • Melting Point: ~60–65°C (may vary slightly by batch purity)
  • Odor: Odorless or faint characteristic odor

Pharmacological Classification

  • Class: Anabolic steroid
  • Base Compound: Methenolone (DHT-derived compound)
  • Ester Type: Enanthate (long-acting ester)

Pharmacokinetics (General)

  • Half-life: ~7–10 days (when formulated for injection)
  • Release Profile: Slow and sustained due to enanthate ester
  • Anabolic Activity: Moderate
  • Androgenic Activity: Low

General Characteristics

Methenolone Enanthate is known for its relatively mild androgenic profile compared to many other anabolic compounds. Because it is derived from dihydrotestosterone (DHT), it does not convert to estrogen via aromatization, which influences its overall hormonal profile in research contexts.

The enanthate ester extends the compound’s duration of action, allowing for less frequent administration when used in formulated preparations.


Typical Applications

  • Pharmaceutical research
  • Historical clinical use for:
    • Muscle wasting conditions
    • Recovery support in catabolic states
    • Certain cases of anemia

Quality Specifications (Typical)

  • Assay (HPLC): ≥ 98%
  • Loss on Drying: ≤ 0.5%
  • Heavy Metals: ≤ 10 ppm
  • Residual Solvents: Within pharmacopeia limits

Storage Conditions

  • Store in a cool, dry environment
  • Protect from direct light and moisture
  • Keep container tightly closed
  • Recommended long-term storage: 2–8°C

Stability

  • Stable under recommended storage conditions
  • Degrades with prolonged exposure to heat, light, or oxygen

Regulatory & Safety Notes

  • Classified as a controlled substance in many jurisdictions
  • Not intended for unsupervised human use
  • Handling should follow appropriate laboratory safety procedures