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Clenbuterol vs Stenabolic: side-by-side comparison

Fat Burner

Clen · Spiropent · Ventipulmin

A powerful Beta-2 agonist that increases basal metabolic rate and lipolysis. Originally developed as a bronchodilator, now widely used for rapid fat loss.

6.0/10 natty
Full breakdown →
VS
Fat Burner

SR9009 · SR-9009

A Rev-Erb agonist that improves metabolic rate and circadian rhythms. Enhances exercise capacity and metabolism without affecting hormones.

5.0/10 natty
Full breakdown →

6 / 10 natty scale / 5

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.

ClenbuterolStenabolic
6.0

Natty scale

1 natural · 10 heavyΔ1

5.0
4.5

Effectiveness

Documented effect · of 5Δ1

3.5
4.0

Side-effect severity

Documented burden · of 5Δ2

2.0

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.

ClenbuterolStenabolic

Cardiometabolic

Organ strain

Systemic

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

ClenbuterolStenabolic
Fat Burner
Classmatch
Fat Burner
Oral
Routematch
Oral
20-120 mcg/dayDaily oral, typically 2 weeks on, 2 weeks off cycling
Typical dose
10-30 mg/dayDaily oral, split into 3-4 doses due to the short (~4 hour) half-life. Some users switch to injectable (reportedly ~5-10mg) or sublingual dosing to bypass first-pass metabolism and improve bioavailability, community-reported, not clinically verified.
35-48 hours
Half-life
~4 hours
4-8 weeks
Typical run
6-8 weeks
Not approved for human use
Legal status
Research chemical
ProhibitedS1.2 Other Anabolic Agents
WADAmatch
ProhibitedS4. Hormone and Metabolic Modulators
urine ~2 wks
Detection
–

Benefit side

What each is for

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

ClenbuterolStenabolic
CuttingPerformance

Run for

Rapid Fat LossSignificantly increases metabolic rate for accelerated fat burning.
Muscle PreservationA 2025 controlled human trial found clenbuterol directly increased muscle protein content and produced a modest (~0.9kg) lean mass gain via non-hormonal PKA/S6 signalling, on top of its anti-catabolic effect, though this signalling desensitizes within about two weeks.
BronchodilationOpens airways, improving breathing during cardio.

Documented upside

  • Significant increase in metabolic rate
  • Enhanced lipolysis
  • Mild anti-catabolic effects
  • Improved cardiovascular performance
  • Appetite suppression

Run for

Metabolic EnhancementIncreases metabolic rate and energy expenditure.
Exercise CapacityImproves endurance and exercise performance.
Circadian RegulationMay improve sleep-wake cycles and circadian rhythm.

Documented upside

  • Increased metabolism
  • Enhanced exercise capacity
  • No hormonal effects
  • May improve sleep patterns
  • Fat loss support

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.

ClenbuterolStenabolic
Heart

None documented

Mood, sleep & CNS
Other documented effects

The exit

Hormonal fallout & recovery

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

ClenbuterolStenabolic
Not required
PCT
Not required
While-on only
What sticks
While-on only

Clenbuterol

Not hormonal. No PCT required.

Stenabolic

Not hormonal. No PCT required.

Read-out

How they separate

  1. 01

    Enhancement

    Clenbuterol sits 1 point higher on the natty scale (6/10 vs 5/10): a bigger step beyond natural at its typical protocol.

  2. 02

    Side-effect bill

    Clenbuterol's documented side-effect severity is heavier (4/5 vs 2/5). The body-load fingerprint above shows where that weight actually lands.

  3. 03

    Body load

    The widest gap at typical protocols is heart structure (Clenbuterol 7.8/10 vs 0/10), then blood pressure (Clenbuterol 7.8/10 vs 0/10).

  4. 04

    Coming off

    Neither requires PCT: both leave the natural testosterone axis running.

  5. 05

    Logistics

    typical runs are 4-8 weeks vs 6-8 weeks.

  6. 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.

Full breakdownClenbuterol→Full breakdownStenabolic→

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