Primobolan (Methenolone Enanthate) is a DHT-derivative anabolic steroid renowned for its exceptionally mild side effect profile and high safety margin. It does not aromatize, has low androgenic activity, and is considered one of the safest injectable AAS available. It is a favorite for lean tissue preservation during cutting phases and for those prioritizing health alongside performance.
Notes
Primobolan is often considered the "gentleman's steroid" due to its mild and manageable side effect profile. The trade-off for this safety is that effective doses are significantly higher than most other AAS (600-1000mg/week is common). This makes it an expensive compound to run. Primobolan is highly valued for cutting phases, contest prep, and by users who prioritize long-term health. It stacks exceptionally well with testosterone and other mild compounds. It is one of the few AAS that has been used clinically in women and children (at low doses) with an acceptable safety profile.
Methenolone is a DHT derivative with a 1-methyl modification and an additional double bond at the C1-2 position. It binds to the androgen receptor with moderate affinity and exhibits an anabolic-to-androgenic ratio of approximately 88:44 (relative to testosterone at 100:100). It cannot be aromatized to estrogen due to its DHT-derived structure. Methenolone has been shown to directly enhance immune function, possibly through upregulation of immune cell AR expression. It has strong anti-catabolic properties, binding to glucocorticoid receptors and interfering with cortisol-mediated muscle catabolism. It enhances nitrogen retention effectively even at moderate doses, making it particularly useful during caloric restriction. Unlike many AAS, it does not significantly increase IGF-1 levels.
Methenolone Enanthate is slowly absorbed from the intramuscular injection site. Peak plasma levels are reached in 2-4 days with a terminal half-life of 7-10 days. Steady-state is achieved in approximately 5-6 weeks. The compound undergoes hepatic metabolism but is NOT c17-alpha alkylated, meaning it poses minimal hepatotoxic risk. Metabolites are primarily excreted in urine. The enanthate ester provides sustained release suitable for twice-weekly injection. Due to the moderate receptor binding affinity, higher milligram doses are needed compared to more potent AAS to achieve equivalent anabolic effects.
Typical Dose
400-600mg/week (beginner), 600-800mg/week (intermediate), 800-1200mg/week (advanced)
Frequency
2x per week for stable blood levels
Administration
Intramuscular injection
Half-Life
7-10 days (enanthate ester)
Contraindications
Begin PCT 14 days after the last Primobolan injection. Primobolan is less suppressive than most AAS, so recovery is generally smoother. Standard PCT: Nolvadex 20mg/day for 4-6 weeks, or Clomid 50mg/day for 3-4 weeks. HCG during cycle at standard doses is beneficial but less critical than with more suppressive compounds. Bloodwork 4-6 weeks after PCT to confirm recovery.