Skip to content

Clenbuterol vs Ephedrine: 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

Ephedra · ECA Stack · Ma Huang

A sympathomimetic amine that works through both direct beta-receptor activation and indirect norepinephrine release to increase thermogenesis and metabolic rate. The classic fat burner, often stacked with caffeine and aspirin (ECA stack). The JAMA meta-analysis of ephedra/ephedrine trials shows ~0.9 kg/month weight loss above placebo. Carries significant cardiovascular risks.

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.

ClenbuterolEphedrine
6.0

Natty scale

1 natural · 10 heavyΔ1

5.0
4.5

Effectiveness

Documented effect · of 5Δ0.5

4.0
4.0

Side-effect severity

Documented burden · of 5Δ1

3.0

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.

ClenbuterolEphedrine

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

ClenbuterolEphedrine
Fat Burner
Classmatch
Fat Burner
Oral
Routematch
Oral
20-120 mcg/dayDaily oral, typically 2 weeks on, 2 weeks off cycling
Typical dose
20-75 mg/daySplit into 2-3 doses/day (commonly 20-25mg per dose); ranges above are total daily amounts. Avoid afternoon/evening dosing due to insomnia.
35-48 hours
Half-life
3-6 hours
4-8 weeks
Typical run
4-12 weeks
Not approved for human use
Legal status
Controlled substance
ProhibitedS1.2 Other Anabolic Agents
WADAmatch
ProhibitedS6. Stimulants
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.

ClenbuterolEphedrine
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

Fat Loss/ThermogenesisThe JAMA meta-analysis (Shekelle et al. 2003) found ~0.9 kg/month weight loss above placebo (0.6-1.3 kg/month across combinations), alongside a 5-10% increase in energy expenditure. In the landmark 24-week Astrup et al. (1992) RCT, the ephedrine+caffeine group lost 16.6 kg vs 13.2 kg with placebo (3.4 kg more, p=0.0015).
Appetite SuppressionApproximately 75% of ECA stack's fat loss efficacy is attributed to decreased appetite. Only 25% from thermogenic effects.
Muscle Preservation During CuttingStudies show ephedrine + caffeine users lose more fat mass and less lean body mass compared to controls during weight loss.
Energy/StimulationCNS stimulant effects provide energy and focus for training during caloric deficit.

Documented upside

  • Meta-analysis (Shekelle et al. 2003, JAMA): ~0.9 kg/month weight loss above placebo (0.6-1.3 kg/month range)
  • Increases energy expenditure by 5-10%
  • 75% of effect from appetite suppression
  • Preserves lean mass during weight loss
  • Synergistic with caffeine (ECA stack)
+3 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.

ClenbuterolEphedrine
Heart
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.

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

Clenbuterol

Not hormonal. No PCT required.

Ephedrine

Does not affect HPT axis. 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 3/5). The body-load fingerprint above shows where that weight actually lands.

  3. 03

    Body load

    The widest gap at typical protocols is mood & sleep (Clenbuterol 7.8/10 vs 4/10), then cholesterol / apob (Clenbuterol 2.8/10 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 4-12 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 breakdownEphedrine→

More matchups

Clenbuterol vs CardarineClenbuterol vs DNPEphedrine vs StenabolicEphedrine vs T3 (Cytomel)