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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 supplement potency that may differ from the label.
What the evidence says
Yohimbine doesn't have enough studies with structured effect-size data yet to pool a verdict. Browse the studies below for individual findings.
Most evidence is from high-quality meta-analyses and randomised trials published 1981–2026 with a typical study size of 14 participants.
Based on 47 studies · 3 meta-analyses · 38 RCTs · 14 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.
37 randomised trials
every one checked individually
Every randomised or controlled trial of Yohimbine indexed in PubMed, not a hand-picked subset. Meta-analyses and systematic reviews are deliberately excluded from this count: most of them cover many compounds at once, so counting them would inflate it.
PubMed · as of Jul 2026
3 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momentum for Yohimbine, not proof of effect — a registration is a plan, and posted results are sponsor-reported, not peer-reviewed.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 Nov 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.
Cohen and colleagues (published 2016) analysed 49 US yohimbe/yohimbine supplement brands. Yohimbine per serving ranged from none detected to 12.1 mg. Eleven brands declared a quantity; their measured amounts ranged from 23% to 147% of that declaration.
These findings describe the sampled products and do not establish the safety of a particular form.
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. Yohimbine raises noradrenergic tone, and in a study of people in early cocaine withdrawal it provoked panic attacks in 71%.
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: If you develop a new or unexpected symptom, pause this optional product and seek advice before trying a lower dose, a different schedule or an added remedy. Follow any urgent instructions for the symptom now.
Tip: If you develop a new or unexpected symptom, pause this optional product and seek advice before trying a lower dose, a different schedule or an added remedy. Follow any urgent instructions for the symptom now.
Tip: Discontinue and seek care; avoid in anxiety/cardiac conditions
Yohimbine has an evidence score of 5/10 — moderate evidence based on 47 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 supplement potency that may differ from the label. Representative study: PMID 9649257.
Dosing for Yohimbine: 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, so check the right dose for you with a healthcare provider.
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. Reported side effects include panic attack / hypertensive episode, increased heart rate and blood pressure, anxiety, jitteriness, insomnia. How often they occur is not established for all of them. Use caution if any of these apply to you: Hypertension or cardiovascular disease; Anxiety, panic, or other psychiatric disorders; Kidney or liver disease.
Caffeine
Probably helpsBlocks adenosine receptors to boost alertness, reaction time, and endurance — an umbrella review of 21 meta-analyses found it ergogenic for endurance, strength and power.
Ashwagandha
Likely helpsReduces cortisol and anxiety while improving sleep quality and physical recovery in stressed adults.
Maca
Too few graded studiesAndean root with modest evidence for improving sexual desire — small RCTs are encouraging but reviews still rate the overall evidence as limited.
CoQ10
Likely helpsA lipid-soluble antioxidant central to mitochondrial energy production, with the strongest trial support for fertility/IVF outcomes and heart failure.
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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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