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Yohimbine HCl
The purified alkaloid (not crude yohimbe bark) — an alpha-2 adrenoceptor antagonist with modest evidence for erectile dysfunction and fasted fat loss, but real anxiety and cardiovascular risks and notoriously mislabeled supplement potency.
What the evidence says
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 1981–2026 with a typical study size of 41 participants.
Based on 47 studies · 3 meta-analyses · 38 RCTs · 354 total participants
Confidence
High confidenceBy outcome
A Moderate 5.0 reflects two meta-analyses supporting yohimbine for erectile dysfunction and a small RCT plus human mechanism work for fasted fat loss, offset by only modest effect sizes, real anxiety and cardiovascular side effects (panic attacks, raised BP/HR), and notoriously inaccurate supplement labeling.
39 rigorous studies
37 randomized trials · 2 meta-analyses · 0 systematic reviews
Our evidence rating for Yohimbine is accountable to this entire body of rigorous research indexed in PubMed — not a hand-picked subset.
PubMed · as of Jul 2026
2 trials ongoing or recruiting · 37 completed on ClinicalTrials.gov
9 of the completed trials have posted results
Registered trials show research momentum for Yohimbine, not proof of effect — a registration is a plan, and posted results are sponsor-reported, not peer-reviewed. They are never counted toward the evidence rating above.
Browse these trials on ClinicalTrials.govClinicalTrials.gov · as of Sep 2026
Yohimbine HCl is the standardized, purified alkaloid of the West African yohimbe tree (Pausinystalia johimbe) — distinct from the crude bark, where alkaloid content is wildly variable.
It is an alpha-2 adrenoceptor antagonist: by blocking the pre-synaptic alpha-2 brake on noradrenaline release, it raises sympathetic 'fight-or-flight' tone, which increases lipolysis (especially in 'stubborn' fat depots like the gluteal/thigh region that are dense in alpha-2 receptors) and peripheral blood flow.
That mechanism underpins its two real, if modest, uses. For erectile dysfunction, a 1998 meta-analysis of seven RCTs found yohimbine superior to placebo (OR 3.85), and a 2021 systematic review confirmed a benefit that is clearest when combined with other agents.
For body composition, a small RCT in elite soccer players found ~2% lower body fat over 21 days with no performance change — fat-loss is real but small and most relevant fasted, and not a weight-loss shortcut.
The honest caveats are serious: yohimbine is a stimulant that raises heart rate and blood pressure and reliably provokes anxiety, jitteriness, and outright panic attacks (one clinical study saw panic in 71% of vulnerable subjects). It interacts dangerously with MAOIs, antidepressants, and other stimulants.
Compounding all of this, an analysis of 49 US supplements found yohimbine content ranging from none to 12 mg per serving, most labels inaccurate (23-147% of stated dose), and many omitting any safety warning.
Standardized yohimbine HCl is the only sensible form, started at the lowest dose, and avoided entirely by anyone with cardiovascular or anxiety risk.
Blocks the pre-synaptic alpha-2 'brake' on noradrenaline release, increasing sympathetic noradrenergic tone.
Alpha-2 blockade lifts the antilipolytic, vasoconstrictive brake on fat that is dense in alpha-2 receptors (e.g. gluteal/thigh), increasing lipid mobilization and blood flow — strongest in the fasted state.
Sympathetic and vascular changes can improve erectile function, the best-supported clinical use.
How Yohimbine works — from molecular targets to health outcomes. Click an edge to see supporting research.This visualization is in beta — pathways are being refined and expanded.
Avoid — yohimbine raises heart rate and blood pressure.
Avoid — reliably provokes anxiety and panic.
Avoid.
Avoid — dangerous interactions.
Risk of a dangerous blood-pressure surge (hypertensive crisis) — do not combine.
Additive noradrenergic effects; raised blood pressure and anxiety.
Additive cardiovascular stimulation — raised heart rate/blood pressure, arrhythmia risk.
Yohimbine can counteract antihypertensives and destabilize blood pressure.
May increase blood pressure and side effects.
Tip: Use lowest dose; avoid if any cardiovascular risk
Tip: Take early in the day; reduce dose or stop
Tip: Reduce dose
Tip: Discontinue and seek care; avoid in anxiety/cardiac conditions
Yohimbine has an evidence score of 5/10 — moderate evidence based on 36 indexed studies, including 2 meta-analyses. The purified alkaloid (not crude yohimbe bark) — an alpha-2 adrenoceptor antagonist with modest evidence for erectile dysfunction and fasted fat loss, but real anxiety and cardiovascular risks and notoriously mislabeled supplement potency. Representative study: PMID 9649257.
The commonly studied dose of Yohimbine is Standardized yohimbine HCl ~0.2 mg/kg (roughly 5-15 mg) up to 1-2x daily; start at the lowest dose, ideally fasted for the fat-loss effect. Never combine with other stimulants.. Individual needs vary — start at the lower end of the range and adjust based on how you respond.
The best time to take Yohimbine is in the morning. It can be taken on an empty stomach. Taken earlier in the day, typically fasted, because the lipolytic effect is blunted by insulin and because its stimulant action disrupts sleep.
Yohimbine should be used with caution — talk to a healthcare provider before taking it. The most commonly reported side effects are increased heart rate and blood pressure, anxiety, jitteriness, insomnia, headache, nausea, sweating. Use caution if any of these apply to you: Hypertension or cardiovascular disease; Anxiety, panic, or other psychiatric disorders; Kidney or liver disease.
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Reviewed by Dr. Baher Al Hakim · Last reviewed June 2026 · evidence from 47 studies · how we score · editorial policy
This information is for educational purposes only. It is not a substitute for professional medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement or medication.
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