Masteron vs Primobolan: side-by-side comparison
Drostanolone · Mast · Drostanolone Propionate
A DHT-derived compound used primarily as a cosmetic finisher for competition. Provides muscle hardness, dryness, and acts as a mild anti-estrogen.
Primo · Methenolone · Methenolone Enanthate
A DHT-based steroid favored for its high safety profile and low side-effect burden. Often used in high doses for lean mass preservation. Long rumored in bodybuilding lore to have been Arnold Schwarzenegger's favorite steroid.
6 / 10 natty scale / 6
Same lane
Both sit in the same class and are run for cutting. This is a like-for-like comparison: read the gaps as real trade-offs.
The tape
Core ratings
The same three rulers every entry on the site is scored with, read head to head.
Natty scale
1 natural · 10 heavy
Effectiveness
Documented effect · of 5
Side-effect severity
Documented burden · of 5Δ0.5
Cost side
Body-load fingerprint
Where each one actually lands its strain, on the calculator's thirteen channels. Tap a row for what it means and which labs track it.
Cardiometabolic
Organ strain
Hormonal
Systemic
Injection & site care
Bars show strain at each one's typical protocol, not your dose. ≈ marks values inferred from side-effect data or category rather than hand-graded. For your numbers, run the calculator.
Logistics
The vitals
Benefit side
What each is for
Shared goals carry both dots; a goal with one dot belongs to that side alone.
Run for
Documented upside
- Enhanced muscle hardness and density
- Increased dryness and vascularity
- Anti-estrogenic properties
- Increases free testosterone via SHBG binding
- No water retention
Run for
Documented upside
- No estrogen conversion (no gyno or water retention)
- Mild on hair (compared to other DHT derivatives)
- Good for cutting and maintaining lean mass
- Relatively safe for long cycles
- Suitable for women at low doses
The downsides
Side effects, aligned
Each entry's documented side effects, sorted onto the same body systems so the gaps and the overlaps are visible. Tap any effect for the detail.
None documented
None documented
The exit
Hormonal fallout & recovery
What each does to your own hormone axis while on, and what leaving it costs.
Masteron
Standard SERM PCT (e.g. Nolvadex 40/40/20/20). Start timing by ester: ~2 weeks after the last Enanthate pin, ~3-4 days after Propionate. Masteron does not aromatize, so estrogen rebound is not the concern; restoring natural testosterone is.
Primobolan
Standard PCT required. Due to long half-life, wait 2-3 weeks after last injection before starting PCT.
Read-out
How they separate
- 01
Enhancement
They land at almost the same point on the natty scale (6/10 vs 6/10): a similar distance beyond natural.
- 02
Side-effect bill
Masteron's documented side-effect severity is heavier (2.5/5 vs 2/5). The body-load fingerprint above shows where that weight actually lands.
- 03
Body load
The widest gap at typical protocols is cholesterol / apob (Masteron 5.5/10 vs 2.8/10), then blood thickness (Masteron 5.5/10 vs 2.8/10).
- 04
Coming off
Both suppress natural testosterone production: coming off either means a recovery phase, not just stopping.
- 05
Logistics
typical runs are 6-10 weeks vs 12-20 weeks.
- 06
Tested athletes
Both are WADA-prohibited: neither belongs anywhere near tested competition.
Generated from each entry's data file. Descriptive, not a recommendation; nothing here is medical advice.