Comparison
Masteron vs Primobolan
Hard, dry detail (Masteron) vs. sustainable, clean gains (Primobolan).
Masteron
Injectable DHT-Derivative AAS
Primobolan
DHT-Derived Anabolic Steroid (Non-Aromatizing)
Effectiveness Profile
At a Glance
| Masteron | Primobolan | |
|---|---|---|
| Type | Steroid | Steroid |
| Legal status | Schedule-III | Schedule-III |
| Half-life | Propionate: 2–3 days; Enanthate: 7–10 days | 10.5 days (enanthate); 4–6 hours (acetate) |
| Preferred route | IM | IM |
| Dose frequency | three-times-weekly | twice-weekly |
| Beginner dose | 300–400 mg | 300–400 mg |
| Intermediate dose | 400–600 mg | 500–700 mg |
| Advanced dose | 600–800 mg | 800–1000 mg |
| Cycle length | 8–16 wks | 10–20 wks |
| Bioavailability | — | 45% |
| Time to peak | 36h | 48h |
| Active duration | 72h | 336h |
| Storage | Room temperature, away from light | Room temperature, dry, out of direct light |
| PCT required | Yes | Yes |
| Ancillaries required | Yes | Yes |
| Safe for women | No | Yes |
| Anabolic / androgenic | 62 / 25 | 88 / 44 |
Verdict
Masteron wins for maximal hardness, visible physique grain, aggressive SHBG binding, contest-prep polish, and waterless finish at low body fat. It's the go-to for the last 4–6 weeks before a show or shoot when you want every line out and zero bloat — especially if you want a strong anti-estrogenic push to look tighter in photos or on stage. Hair safety is lower, but sheer visual impact is unmatched by DHTs.
Primobolan wins for long-term sustainability, side-effect tolerability, and lean, non-bloated gains you can maintain. Primo is dramatically easier on blood pressure, hair, and lipids (especially at <700 mg/wk), with little to no aromatization or progestogenic risk, and far less suppression per mg than most AAS. It's the king of slow, quality recomp — especially if you're patient or want to minimize risk while staying on for months.
Pick A or B?
Pick Masteron if:
- You're sub-12% body fat and want sharper detail or last-stage dryness for a shoot or contest
- You want aggressive SHBG binding to enhance free test or clear up water retention from other compounds
- You need a strong anti-estrogen push on a high-test stack or have persistent water retention issues
- You're stacking with short esters and want a hard, crisp finish without transition
- You're chasing visual grain that only high-affinity DHTs can deliver (especially if already running primo)
Pick Primobolan if:
- You want slow, sustainable, lean gains with almost zero water retention or aromatization risk
- You're prioritizing long-term hair and lipid health without sacrificing physique enhancement
- You're running a longer cutter or lean bulk (12–20+ weeks) and want minimal side effects or bloodwork disruption
- You have access to legitimate primo and can afford higher doses (500–700+ mg/wk)
- You're a woman or older user seeking the mildest possible "real" AAS with an excellent risk profile