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Yhb5.0

Yohimbine Research

Mostly mechanism / observationalLimited safety

6 peer-reviewed studies

What the evidence says

Mostly mechanism / observational

Most Yohimbine studies are mechanism or observational rather than RCTs that measure a clinical effect — keep findings provisional.

Most evidence is from high-quality meta-analyses and randomised trials published 1993–2021 with a typical study size of 20 participants.

Based on 6 studies · 2 meta-analyses · 2 RCTs · 34 total participants

Confidence

High

By outcome

Erectile function & male vitalityModerate improvement in erectile function vs placebo, clearest when combined with other agents · 2-8 weeks · Raises sympathetic/noradrenergic tone and supports erectile function; not a testosterone or hormone modulator per se · 2-8 weeks
Too few graded studies2 studies
Fat loss & body compositionModest fat mobilization (best fasted, in stubborn depots); a small RCT showed ~2% lower body fat over 3 weeks · 3-8 weeks
Too few graded studies2 studies
Endurance & exercise performanceUsed as a pre-workout stimulant; no demonstrated improvement in strength, power, or performance markers · 30-60 minutes (acute)
Too few graded studies1 study
Anxiety & stress
Too few graded studies1 study
Heart & blood pressure
Too few graded studies1 study
Safety profile
Too few graded studies1 study

Steady research

1 study in the last 5 years · Latest meta-analysis: 2021

199320072021

1Meta-Analysis1998

The meta-analysis demonstrated that yohimbine is superior to placebo in the treatment of erectile dysfunction (odds ratio 3.85, 95% confidence interval 6.67 to 2.22). Serious adverse reactions were infrequent and reversible.

Ernst E et al. · The Journal of urology (1998)

Yohimbine significantly more effective than placebo for ED
Adverse events were mostly mild and reversible
Supports yohimbine (the isolated alkaloid) for ED specifically

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2Meta-Analysis2021

Both Yohimbine alone (OR 2.08, 95% CI 1.30-3.32) and combined (OR 6.35, 95% CI 3.01-13.41) showed a significantly greater probability of erectile function improvement compared to the placebo group.

Wibowo DNSA, Soebadi DM, Soebadi MA · Turkish journal of urology (2021)

Systematic review and meta-analysis of eight RCTs comparing yohimbine to placebo for ED
Yohimbine improved erectile function alone and (more strongly) in combination
Yohimbine alone did not clearly improve broader sexual function unless combined

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3Pilot1993

Alpha-2 adrenoceptor activation causes marked retention of lipids in adipose tissue due to vasoconstriction in combination with antilipolysis ... The pseudolipolytic effect of clonidine was significantly more pronounced in gluteal as compared with abdominal adipose tissue.

Galitzky J, Lafontan M, Nordenström J, Arner P · The Journal of clinical investigation (1993)

In-situ microdialysis of human subcutaneous adipose tissue in healthy subjects
Alpha-2 activation retains fat via vasoconstriction plus antilipolysis; yohimbine (alpha-2 antagonist) blunts it
Effect more pronounced in gluteal than abdominal fat — the mechanistic basis of 'stubborn fat'

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4Observational2016

The quantity of the most active alkaloid, yohimbine, per recommended serving ranged from none detected to 12.1 mg ... Most of these were inaccurately labelled (actual content ranged from 23% to 147% of the content on the label).

Cohen PA, Wang YH, Maller G, DeSouza R, Khan IA · Drug testing and analysis (2016)

Analytical study of 49 US yohimbe/yohimbine supplement brands by LC-MS
Yohimbine per serving ranged from none detected to 12.1 mg; most labels were inaccurate (23-147% of stated)
Only 22% listed a specific yohimbine quantity; 18% gave no adverse-effect information

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5RCTn=20 · very small study2006

Percentage of body fat significantly decreased in the yohimbine group after the supplementation protocol (9.3 +/- 1.1 vs. 7.1 +/- 2.2%; p < 0.05) ... There were no changes in exercise performance indicators ... within or between trials.

Ostojic SM · Research in sports medicine (2006)

Randomized placebo-controlled trial in 20 elite male soccer players, 20 mg/day for 21 days
Body fat percentage significantly decreased with yohimbine vs placebo
No change in body mass, muscle mass, or any performance indicator (press, jump, sprint, dribble)

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6RCTn=14 · very small study1994

Seventy-one percent of subjects experienced a yohimbine-induced panic attack during early discontinuation compared with none during late discontinuation.

McDougle CJ, Black JE, Malison RT, Zimmermann RC, Kosten TR, Heninger GR, Price LH · Archives of general psychiatry (1994)

Double-blind challenge with intravenous yohimbine vs placebo in human subjects
Yohimbine raised noradrenergic activity (MHPG), self-rated nervousness, and provoked panic attacks
Demonstrates yohimbine's reliable anxiogenic/panic and sympathetic effects

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View in Research Library

Yohimbine Research

Mostly mechanism / observational

Yohimbine for erectile dysfunction: a systematic review and meta-analysis of randomized clinical trials.

Yohimbine as a treatment for erectile dysfunction: A systematic review and meta-analysis.

Role of vascular alpha-2 adrenoceptors in regulating lipid mobilization from human adipose tissue.

Pharmaceutical quantities of yohimbine found in dietary supplements in the USA.

Yohimbine: the effects on body composition and exercise performance in soccer players.

Noradrenergic dysregulation during discontinuation of cocaine use in addicts.