Methenolone Enanthate (Primobolan)
A mild, DHT-derived injectable (Primobolan) with a reputation as one of the 'safest' anabolic steroids. It is non-aromatising with a low androgenic burden, giving slow, lean gains with minimal oestrogenic or hepatic effects. It has genuine clinical history for anaemia and wasting, but its mildness means modest muscle-building relative to stronger compounds, and it remains fully suppressive.
01 Overview
Methenolone enanthate is the injectable ester of methenolone, a 1-methyl DHT derivative. It has real clinical pedigree — it was used for anaemia, malnutrition, premature infants and immune support — which supports a moderate research score. It does not aromatise and is not hepatotoxic in the injectable form, so it avoids oestrogenic and liver concerns, and its low androgenic rating makes it comparatively gentle on hair and skin.
The trade-off is potency: methenolone is genuinely mild, producing slow, quality lean gains rather than dramatic mass, and is often used in cutting phases or by those prioritising a favourable side-effect profile. Despite its gentle reputation it still suppresses natural testosterone and lowers HDL like other anabolic steroids, so it is not free of systemic effects.
02 Mechanism
Moderate-affinity androgen-receptor agonist derived from DHT; cannot aromatise and has low androgenicity, producing modest anabolic effects without oestrogenic activity.
03 Dosing
| Tier | Dose | Route | Notes |
|---|---|---|---|
| Therapeutic | 100–200 mg/wk | IM | Historical clinical dosing for anaemia/wasting. |
| Common | 400–600 mg/wk | IM | Mild compound; higher doses used for meaningful gains. |
| Heavy | 600–800 mg/wk | IM | Cost and mildness make very high doses common. |
Ester comparison
| Ester | Half-life | Injection freq. | Testosterone by mass |
|---|
04 Effects
| Effect | Magnitude | Evidence | |
|---|---|---|---|
| Slow, lean muscle gainGradual quality lean mass with minimal water retention; magnitude modest versus stronger agents. | Anecdotal | ||
| Lean mass preservation in a deficitPopular for cutting to retain muscle. | Anecdotal | ||
| Increased red blood cell productionHistorically used for anaemia, reflecting an erythropoietic effect. | Clinical |
05 Side effects
| Effect | Severity | Frequency | Evidence | Countermeasures |
|---|---|---|---|---|
| Adverse lipid changesHDL reduction as with other anabolic steroids, generally milder. | Mild | Common | Observational | |
| Mild androgenic effectsAcne or hair-loss acceleration possible in the predisposed, but low relative to other DHT derivatives. | Mild | Uncommon | Observational | |
| HPTA suppressionSuppresses endogenous testosterone, though sometimes described as less severe than more androgenic compounds. | Moderate | Universal | Observational |
06 Commonly used with
What methenolone is combined with, and why. This is about intent rather than safety — the interactions table below covers what is dangerous. Nothing here is listed without what it costs.
| Compound | Frequency | Purpose & trade-off |
|---|---|---|
| Stacked compounds | ||
| TestosteroneTRT/base dose | Primobolan is suppressive and only mildly anabolic, so it is run on a testosterone base to provide the main growth stimulus and prevent low-androgen symptoms.Trade-off: Adding testosterone reintroduces aromatisation and its estrogenic sides, undercutting Primo's reputation as a clean, low-side compound. | |
| Trenbolone enanthaterecomp | Stacked in lean recomp cycles where Primo contributes steady non-estrogenic gains and trenbolone supplies the hard, dry, potent anabolic effect.Trade-off: Trenbolone dominates the side-effect profile with sweats, insomnia and cardiovascular strain, negating much of the gentleness Primo is chosen for. | |
| Support & ancillaries | ||
| AnastrozoleAI | Used to control estrogen from the aromatising testosterone base, since methenolone itself does not aromatise and adds no estrogenic load.Trade-off: Because only the base aromatises, an AI is easy to overdose here, and crashed estradiol will damage lipids, libido and joint health. | |
| Post-cycle | ||
| TamoxifenPCT | Runs after cycle to restart natural testosterone production suppressed by methenolone and the testosterone base.Trade-off: SERM-based recovery takes weeks and may be incomplete, with tamoxifen causing mood and vision side effects during PCT. | |