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Fat BurnerNot WADA ProhibitedCompare

Yohimbine

Also known as: Yohimbe, Yohimbine HCL, Pausinystalia yohimbe

3
1 · Natty510 · Enhanced

Lower numbers = closer to natural. Higher numbers = more enhanced.

Why this rating?

Per PubMed RCTs, yohimbine is a plant-derived alpha-2 adrenergic antagonist (Pausinystalia yohimbe bark) that blocks alpha-2 receptors to enhance fat mobilization from stubborn areas. A controlled trial in professional soccer players (20mg/day for 21 days) showed body fat drop from 9.3% to 7.1%, with no significant change in total body mass or muscle mass; a second RCT in dieting obese women (20mg/day for 3 weeks) showed a modest but significant extra ~1.3kg of weight loss versus diet alone. It does not touch anabolic hormones, requires no PCT, and is legal as an OTC dietary supplement in the USA. Rated 3: a real but narrow, non-hormonal, regional fat-mobilization effect, sitting below other stimulant fat burners in this dataset (phentermine 4, ephedrine 5) given its milder, more targeted action.

Overview

An alpha-2 adrenergic receptor antagonist extracted from Pausinystalia yohimbe bark. Works by blocking alpha-2 receptors on fat cells, particularly effective for "stubborn fat" areas (lower abdomen, hips, thighs) which have high alpha-2 receptor density. MUST be taken fasted - insulin completely negates its effects. Soccer player study showed body fat decrease from 9.3% to 7.1% in 21 days.

Important Warnings

  • •MUST be taken FASTED - insulin completely negates fat-burning effects
  • •Avoid BCAAs before fasted cardio (they spike insulin)
  • •Do NOT combine with caffeine, ephedrine, synephrine, or other stimulants
  • •Contraindicated: anxiety disorders, panic disorder, PTSD, cardiovascular disease
  • •NEVER use with MAOIs - hypertensive crisis risk
  • •Avoid tyramine-rich foods (cheese, liver, red wine)
  • •Banned in Canada, Australia, UK, Netherlands
  • •Supplement label accuracy varies wildly - use Yohimbine HCL not bark extract
  • •Overdose (200mg+) can cause coma, psychosis, seizures
  • •Highly variable bioavailability (7-86% between individuals)

Purpose & Use Cases

Stubborn Fat Mobilization

Targets fat areas with high alpha-2 receptor density (lower abs, hips, thighs). Soccer player study: body fat 9.3% → 7.1% in 21 days.

Fasted Cardio Enhancement

Lipid-mobilizing action is reinforced during physical exercise. Increases plasma free fatty acids before, during, and after exercise.

Caloric Deficit Enhancement

Obese women study: 3.55 kg weight loss vs 2.21 kg placebo over 3 weeks with caloric restriction.

Benefits

  • Specifically targets stubborn fat areas (high alpha-2 receptor density)
  • Soccer study: 9.3% → 7.1% body fat in 21 days
  • Increases plasma norepinephrine ~40-50%, mobilizing free fatty acids and glycerol
  • Effects reinforced by exercise
  • Legal as dietary supplement in USA
  • Relatively inexpensive
  • Well-studied mechanism of action
  • Minimal cardiovascular impact at proper dose (0.2 mg/kg)

Good to Know

It only works fasted, insulin switches it off completely

Yohimbine's fat-mobilising effect depends on low insulin; even a small carb or protein/BCAA hit before fasted cardio blunts or abolishes it. This is the single most important practical rule: take it fasted, 30-60 minutes before low-insulin cardio, and do not sip BCAAs during the session.

It specifically targets "stubborn fat"

Stubborn areas (lower abs, hips, thighs, lower back/love handles) carry a high density of alpha-2 receptors, which normally suppress fat release. By blocking alpha-2, yohimbine lets norepinephrine actually mobilise those depots, which is why it helps most with the last bit of fat rather than overall weight.

Mobilising fat is not the same as burning it

Yohimbine frees fatty acids into the bloodstream, but if you do not oxidise them (via a real deficit plus activity) they simply re-esterify back into fat. It is an adjunct to fasted cardio in an already-lean, dieting person, not a standalone fat burner that works while you sit still.

Use standardised HCL, not bark extract

Yohimbe bark supplements are notoriously inconsistent, and bioavailability swings enormously between people (roughly 7-86%). Dose pharmaceutical yohimbine HCL - commonly 10-20mg/day, close to the ~0.2 mg/kg bodyweight heuristic used in fitness circles and the ~20mg/day dose used in the human fat-loss trials - so you actually know what you took; bark extract makes accurate, safe dosing impossible.

Anxiety and cardiovascular reactivity set the ceiling

Yohimbine activates the HPA axis and raises cortisol, so it can sharply worsen anxiety and panic disorder, and it raises heart rate/blood pressure. It is contraindicated with anxiety disorders, cardiovascular disease and MAOIs (hypertensive-crisis risk), and should not be stacked with other stimulants such as caffeine, ephedrine or clenbuterol.

Dosage Guidelines

Experience LevelDosage Range
Beginner5 – 8 mg/day
Intermediate8 – 16 mg/day
Advanced16 – 20 mg/day
Frequency
Split into 2-3 doses/day (the FDA-cleared 5.4mg tablet label is dosed 1 tablet three times daily). Take doses in the morning/early afternoon - no later than 4 PM - and time one dose 30-60 min before fasted cardio.
Typical Cycle Length
3 – 8 weeks
Notes

The two positive human RCTs for fat loss (top-level soccer players; dieting obese women) both used ~20mg/day total (10mg x2, or 5mg x4), for 3 weeks. This is close to the traditional "0.2 mg/kg bodyweight" rule of thumb used in fitness circles (e.g. ~16-18mg for an 80-90kg person) - note that figure comes from a single acute pre-exercise dosing study, not a chronic trial, so treat it as a community heuristic for scaling the ~20mg trial dose to bodyweight rather than a separately validated protocol. The FDA-cleared prescribing label (5.4mg tablets, for impotence) is 1 tablet 3x/day (16.2mg/day), starting at half a tablet 3x/day (8.1mg/day) and titrating up if tolerated, for no more than 10 weeks continuous use. MUST be taken FASTED - the lipolytic effect is eliminated after eating. Peak plasma levels occur within about an hour. Use standardized Yohimbine HCL (not bark extract) - even HCL shows large person-to-person bioavailability variation (~7-86%).

Half-Life

Range ~15 minutes to 2.5 hours reported across pharmacokinetic studies; peak plasma levels occur within about 1 hour of oral dosing.

Side Effects

Anxiety

common
Severity
3/5

Can significantly worsen panic disorder and anxiety. Activates HPA axis increasing cortisol. Contraindicated with anxiety disorders.

Mitigation

Start with half dose. Avoid if you have anxiety disorder. Do not combine with other stimulants.

Cardiovascular Effects

uncommon
Severity
3.5/5

Tachycardia, hypertension, palpitations, arrhythmias possible. At proper dosing (0.2 mg/kg) cardiovascular effects are minimal.

Mitigation

Do not exceed 0.2 mg/kg. Avoid with cardiovascular disease/hypertension. Monitor HR/BP initially.

Insomnia

common
Severity
2/5

Stimulant effects can disrupt sleep if taken too late.

Mitigation

Take no later than 4 PM. Avoid evening dosing.

Nausea/Headaches

uncommon
Severity
1.5/5

GI upset and headaches occasionally reported.

Mitigation

Usually transient. May improve with continued use.

Drug Interactions

common
Severity
4/5

Theoretical hypertensive crisis with MAOIs. Tyramine-rich foods may precipitate hypertensive crisis. Additive cardiovascular stress with stimulants.

Mitigation

NEVER combine with MAOIs. Avoid tyramine-rich foods. Do not combine with caffeine, ephedrine, synephrine.

General Mitigation Strategies

Start with half the calculated dose to assess tolerance. MUST take fasted - food negates effects AND may increase insulin which opposes fat mobilization. Avoid BCAAs before fasted cardio (spike insulin). Use Yohimbine HCL for consistent dosing - bark extract varies widely. Do not combine with other stimulants. Contraindicated with anxiety, cardiovascular disease, psychiatric conditions, MAOIs.

Post Cycle Therapy (PCT)

✓PCT Not Required

Does not affect HPT axis. No PCT required.

How It Works

Yohimbine blocks presynaptic alpha-2A adrenoceptors, increasing norepinephrine release (40-50% plasma increase). The released norepinephrine stimulates beta-receptors, promoting lipolysis. "Stubborn fat" areas have high alpha-2:beta receptor ratios - alpha-2 activation normally inhibits lipolysis. By blocking alpha-2, yohimbine allows norepinephrine to activate beta receptors and mobilize fat. A single oral 0.2 mg/kg dose (the acute dose used in controlled human trials) produces a lasting increase in plasma free fatty acids and glycerol, an effect reinforced by exercise and abolished by eating.

Fundamentals

Reference on the practices relevant to Yohimbine: how they are done and where they go wrong. Not a recommendation to use it.

Bloodwork: what to measure and when→

The markers that matter here

Warning signs & when to seek care→

When to stop and get help

Common Stacks

  • Yohimbine before fasted cardio (30-60 min prior)
  • Yohimbine + HMB (anti-catabolic that does not spike insulin, unlike BCAAs)
  • DO NOT combine with caffeine, ephedrine, or other stimulants (additive cardiovascular stress)
  • DO NOT take with food - insulin completely blocks effects

WADA Status

✓Not Prohibited by WADA

Yohimbine is not currently listed on the WADA Prohibited List. It is available as a dietary supplement in the USA.

References

Last updated: July 18, 2026