What is Methenolone Enanthate?
Primobolan Depot 200mg/mL (High-concentration Methenolone Enanthate — long-acting injectable AAS) is the enanthate ester of methenolone — C₂₇H₄₂O₃, MW 414.6. The 200mg/mL formulation doubles the dose per mL vs 100mg/mL, reducing injection volume requirements. Active duration: peak ~3–5 days, active ~10–14 days. Mild androgenic profile, high anabolic-to-androgenic ratio. Does not aromatise to oestrogen.
Research Applications
High-Concentration Mild-Anabolic Injectable
200mg/mL format halves injection volume for equivalent dose — precision dosing research
Non-Aromatising Injectable AAS
Anabolic research without oestrogen confounds at higher concentration
Dose-Escalation Studies
High-dose methenolone enanthate studies with reduced injection volumes
Androgen Receptor Binding
Moderate AR affinity — characterised anabolic-to-androgenic binding ratio
Lean Mass Preservation
Muscle preservation in catabolic models without oestrogen co-effects
Quick Specs
| Form | Oil-based injectable solution |
| Concentration | 200mg/mL |
| CAS | 303-42-4 |
| Molecular Formula | C₂₇H₄₂O₃ |
| MW | 414.6 Da |
| Purity | ≥99% by HPLC — every batch |
| Identity | MS molecular weight confirmed — every batch |
| COA | Janoshik-independent, publicly verifiable |
| Vehicle | Pharmaceutical-grade carrier oil + benzyl alcohol/benzoate |
| Aromatisation | None — does not convert to oestrogen |
| Storage | Room temp sealed | 2–8°C recommended |
| Shelf Life | 24 months (unopened) |
