Primobolan (Metenolone Enanthate)
A profile on "Primo," the gold standard for safe, lean gains. Known as Arnold's favorite and the luxury steroid of the bodybuilding world.
Primobolan (Metenolone Enanthate)
Primobolan (Metenolone Enanthate) is widely regarded as one of the safest and most effective "lean mass" steroids available.
Historically linked to the Golden Era physiques (including Arnold Schwarzenegger), it is prized for building quality muscle that is easy to keep, with very few side effects. It is a DHT derivative that does not aromatize.
Quick Specs
| Property | Value |
|---|---|
| Active Compound | Metenolone |
| Half-Life | ~10.5 Days |
| Detection Time | ~5 Weeks |
| Anabolic/Androgenic Ratio | 88 : 44-57 |
| Chemical Family | DHT Derivative |
| Administration | Injectable (IM) |
Mechanism of Action
Primobolan is a Dihydrotestosterone (DHT) derivative with a double bond between carbon 1 and 2. This structure stabilizes the 3-keto group, increasing its anabolic potential while reducing androgenic effects.
It binds very strongly to the Androgen Receptor (AR) and improves nitrogen retention and immune system function.
Pharmacokinetics & Dosing
Half-Life: ~10 Days
- Frequency: Twice Weekly injections are standard to maintain stable levels, despite the long half-life.
- Dosage: Primo is mild.
- Beginner: 300-400mg/week.
- Advanced: 600-800mg/week (often required to see significant mass gains).
- Ester Weight: The Enanthate ester is heavy. 100mg of Primo contains significantly less active hormone than 100mg of Propionate. High doses are volume-heavy (e.g., 600mg might be 6ml of oil).
Primary Effects
1. Pure Lean Tissue
Primo does not cause water retention. Every pound gained is muscle.
2. Fat Loss Support
It has a strong binding affinity to the androgen receptor, which has been linked to direct lipolysis (fat breakdown).
3. Immune System
Unlike many steroids that suppress the immune system, Primo has been shown to boost it (originally designed for muscle wasting in HIV/AIDS patients).
Side Effects & Harm Reduction
The Fake Gear Problem:
Counterfeits: Primobolan is the most faked steroid on the market because the raw powder is expensive. Underground labs often swap it for Testosterone Propionate or Masteron. If you get bloated or aggressive on "Primo," it's probably not Primo.
1. Hair Loss
It is a DHT derivative. It is notorious for stripping hair in men prone to Male Pattern Baldness. Finasteride does not work well here (as it is already a DHT derivative).
2. Low Estrogen (Indirectly)
Primo does not aromatize. If you run high Primo with low Testosterone, your estrogen ratio may drop too low, causing dry joints and low libido.
3. PIP (Post Injection Pain)
High concentration Primo (200mg/ml) is often painful. Standard 100mg/ml is smooth.
Tracking Primobolan
Using the Anabolic Tracker app:
- Inventory: Add Primobolan Enanthate.
- Scheduling: Twice Weekly.
- Metrics: Track Immune Health (sick days).
- Plotter: Because of the long half-life and mild nature, front-loading is rarely necessary or recommended. Just let it build up over 12-16 weeks.
Disclaimer:
This guide is for informational purposes only. Primobolan is a controlled substance. Misuse can lead to permanent health damage.