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Metribolone vs Trenbolone: side-by-side comparison

Anabolic Steroid

Methyltrienolone · Metribolone · M3

An extraordinarily potent oral steroid (a 17-alpha-methylated trenbolone analogue) that was abandoned in development for being too toxic to use. Today it exists mainly as the androgen-receptor research ligand R1881, and, recklessly, as a microgram-dosed pre-contest compound. It is widely regarded as one of the most hepatotoxic androgens ever made.

10.0/10 natty
Full breakdown →
VS
Anabolic Steroid

Tren · Tren A · Tren E

A 19-nor derivative with 5x the anabolic potency of testosterone. It is considered the most powerful physique-altering steroid available, providing extreme hardening, strength, and nutrient partitioning.

10.0/10 natty
Full breakdown →

10 / 10 natty scale / 10

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.

MetriboloneTrenbolone
10.0

Natty scale

1 natural · 10 heavy

10.0
5.0

Effectiveness

Documented effect · of 5

5.0
5.0

Side-effect severity

Documented burden · of 5

5.0

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.

MetriboloneTrenbolone

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

MetriboloneTrenbolone
Anabolic Steroid
Classmatch
Anabolic Steroid
Oral
Route
Injectable (IM)
0-2 mg/dayIf used at all: split into 1-2 doses/day given its short presumed half-life, for only a handful of days, not a sustained daily protocol like other orals
Typical dose
200-700 mg/weekAcetate: daily or EOD injection; Enanthate: 2x/week
Not established
Half-life
1-3 days (Acetate), 7-10 days (Enanthate)
1-2 weeks
Typical run
6-12 weeks
Controlled substance
Legal statusmatch
Controlled substance
ProhibitedS1. Anabolic Agents
WADAmatch
ProhibitedS1. Anabolic Agents

Benefit side

What each is for

Shared goals carry both dots; a goal with one dot belongs to that side alone.

MetriboloneTrenbolone
PerformanceCuttingBulkingRecomposition

Run for

Research Reference Androgen (R1881)Its dominant legitimate use: a high-affinity radioligand and reference agonist for studying the androgen receptor in the laboratory.
Pre-Contest Hardness / Aggression (reckless use)A tiny minority of bodybuilders use microgram-to-low-milligram doses in the final pre-contest days for hardness and drive, a practice defined by its danger, not its wisdom.

Documented upside

  • Extreme potency at microgram-to-milligram doses
  • Non-aromatizing: no estrogenic water retention
  • Dramatic strength, hardness and aggression
  • Invaluable as the R1881 androgen-receptor research ligand

Run for

Extreme HardeningProvides an extremely hard, dry, and vascular appearance unmatched by other compounds.
Nutrient PartitioningDramatically improves the efficiency of calorie utilization, allowing muscle growth even in a deficit.
Strength GainsProduces rapid and significant increases in strength beyond most other steroids.
Body RecompositionEnables simultaneous muscle gain and fat loss more effectively than almost any other compound.

Documented upside

  • Extreme muscle hardness and density
  • Dramatic strength increases
  • Enhanced nutrient partitioning efficiency
  • No water retention or bloating
  • Significant fat loss while building muscle
+1 more on the full page

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.

MetriboloneTrenbolone
Liver

None documented

Lipids

None documented

None documented

Heart
Prolactin
Mood, sleep & CNS
Suppression & fertility

None documented

None documented

Other documented effects

The exit

Hormonal fallout & recovery

What each does to your own hormone axis while on, and what leaving it costs.

MetriboloneTrenbolone
total
HPTA suppression
severe
none
Aromatization
none
high
Liver toxicity
none
high
Hair-loss risk
high
No
DHT-derived
No
Yes
19-nor / progestogenic
Yes
Required
PCT
Required
Semi-permanent
What sticks
Semi-permanent

Metribolone

Metribolone causes total HPTA shutdown, so PCT is required, but the dominant issue is toxicity rather than recovery. Standard SERM PCT (e.g. Nolvadex 40/40/20/20mg/day) after the short course, with bloodwork for liver enzymes, lipids, prolactin and the hormonal axis. hCG can be used pre-PCT for testicular recovery.

Trenbolone

Due to extreme suppression, aggressive PCT is required. Wait 2-3 weeks after last Enanthate injection, or 3-5 days after last Acetate injection.

Read-out

How they separate

  1. 01

    Enhancement

    They land at almost the same point on the natty scale (10/10 vs 10/10): a similar distance beyond natural.

  2. 02

    Body load

    The widest gap at typical protocols is liver strain (Metribolone 10/10 vs 0/10), then kidney load (Trenbolone 5.5/10 vs 2.8/10).

  3. 03

    Coming off

    Both suppress natural testosterone production: coming off either means a recovery phase, not just stopping.

  4. 04

    Logistics

    Metribolone runs as oral, Trenbolone as injectable (im); typical runs are 1-2 weeks vs 6-12 weeks.

  5. 05

    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.

Full breakdownMetribolone→Full breakdownTrenbolone→

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