Yohimbine
Also known as: Yohimbin, Yohimbine HCl, Yohimbinhydrochlorid, Yohimbe, Alpha-Yohimbine, Rauwolscine
Alkaloid that targets exactly the stubborn fat deposits — works only in a fasted state, and its anxiety and blood pressure effects are the reason many stop.
Substance family
They increase metabolic rate or mobilise fat through adrenergic and thermogenic mechanisms. Cardiac load is the shared limiting factor, and it adds up when they are combined.
Strain profile
Where this substance is most likely to hit — a rough orientation, individually dependent on dose, duration and predisposition.
This substance causes
Dosing & protocols by goal
Rough orientation ranges as reported in harm-reduction literature — not an individual treatment plan. Doses are individual and open-ended; frequency depends on the ester or half-life.
Erectile dysfunction (historical medical use)
MedicalDose
5–10 mg / day
Frequency
2–3× daily
Cycle length
Medically supervised
Was used for erectile dysfunction before the PDE5 inhibitors. Replaced by tadalafil and similar substances today.
Fat loss — fasted
AdvancedDose
0.2 mg per kg body weight
Frequency
1× before fasted cardio
Cycle length
During a diet phase
The dose scales with body weight — roughly 14–20 mg for most people. Must be taken fasted: insulin blocks the effect completely, so even a small meal beforehand negates it.
Cautious entry
AdvancedDose
2.5–5 mg
Frequency
1× before fasted cardio
Cycle length
First week
Anxiety and palpitations are strongly individual. Start well below the target dose to find out how you respond before going higher.
Side effect & countermeasure
Typical problems and what you can do to reduce harm — at a glance. Does not replace medical monitoring.
Problem
Anxiety, panic attacks, restlessness
Countermeasure
The most common reason people stop. Yohimbine raises noradrenaline directly, and the response varies enormously between individuals — the same dose is unremarkable for one person and produces a panic attack in another. Start low. Anyone with an anxiety disorder should not use it at all.
Problem
Elevated blood pressure and heart rate
Countermeasure
Measure blood pressure before and during use. Not for anyone with existing hypertension or a cardiac condition. Combined with clenbuterol or high caffeine intake the effects add up — that combination is where the genuine risk sits.
Problem
No effect when not fasted
Countermeasure
Insulin blocks the alpha-2 antagonism completely. Taken after a meal, yohimbine does nothing for fat loss — only the side effects remain. Fasted means genuinely fasted, not 'a small snack'.
Problem
Interaction with antidepressants
Countermeasure
Combination with MAO inhibitors is dangerous, and with SSRIs the effects on blood pressure and anxiety can add. This belongs discussed with a doctor rather than tried out.
Problem
Highly variable content in bark extracts
Countermeasure
Yohimbe bark extract varies by a wide margin in actual alkaloid content — analyses have found products with a fraction of the declared amount and others with several times it. Standardised yohimbine HCl is the only form that can be dosed meaningfully.
Problem
Nausea, dizziness, cold sweats
Countermeasure
Dose-dependent and usually a sign of too much. Reduce rather than push through; the effect on fat mobilisation does not scale further at that point anyway.
Overview
Yohimbine is an alkaloid from the bark of the West African yohimbe tree. Medically it was used for erectile dysfunction before the PDE5 inhibitors replaced it; today its relevance lies almost entirely in fat loss.
What makes it interesting is that it acts on a specific problem no other substance in this field addresses: the fat deposits that remain when everything else has already gone.
What makes it difficult is that its side effects are unusually individual. The same dose that one person barely notices produces a panic attack in another.
Mechanism of Action
Fat cells carry two types of adrenergic receptor. Beta receptors promote fat breakdown; alpha-2 receptors inhibit it. The ratio between them differs by body region — and that is precisely why some areas stay stubborn.
The lower back and abdomen in men, hips and thighs in women, carry a markedly higher density of alpha-2 receptors. Adrenaline reaches those regions during a deficit like any other, but the inhibitory signal dominates. This is the physiological basis of what is usually described as stubborn fat.
Yohimbine blocks alpha-2 receptors. The inhibitory brake comes off, and the affected regions become responsive to the fat-mobilising signal they were previously resisting.
One condition determines whether any of this happens: insulin. Insulin blocks the alpha-2 antagonism completely. Yohimbine taken with any meaningful insulin present does nothing at all for fat mobilisation, while all the side effects still occur. This is not a detail to optimise around — it is the difference between the substance working and being pointless.
Typical Context
Yohimbine is taken fasted, before cardio, at roughly zero point two milligrams per kilogram of body weight — around fourteen to twenty milligrams for most people.
The recommendation to start well below that is not routine caution here. The variation in individual response to noradrenergic stimulation is genuinely large, and it is not predictable from how someone tolerates caffeine. Five milligrams on the first attempt costs nothing and answers the question.
The combination with caffeine is common and works, since the two act on different mechanisms. The combination with clenbuterol is where the actual danger sits: both raise heart rate and blood pressure, and stacking them is how an unpleasant experience becomes a medical one.
For anyone with an anxiety disorder, this is a substance to leave alone entirely. Yohimbine is used in psychiatric research specifically to induce anxiety states under controlled conditions — that is not a side effect at the margin, it is a documented and reliable property.
Side Effects & Risks
- Anxiety, panic attacks, restlessness — highly individual
- Elevated blood pressure and heart rate
- Nausea, dizziness, cold sweats
- Insomnia when taken late in the day
- Tremor
- Interactions with antidepressants, particularly MAO inhibitors
- Highly variable alkaloid content in bark extracts
Blood Work & Monitoring
- Blood pressure — measured at home, before and during use
- Resting heart rate — daily
- Liver values (ALT, AST, GGT) — as a baseline
Harm-Reduction Notes
- Fasted means fasted — insulin blocks the effect entirely, so a pre-workout meal makes it pointless
- Start at 2.5–5 mg to find out how you respond; tolerance is not predictable from caffeine
- Not for anyone with an anxiety disorder, hypertension or a cardiac condition
- Do not combine with clenbuterol; the cardiovascular effects add
- Discuss with a doctor if taking antidepressants — the MAO inhibitor combination is dangerous
- Use standardised yohimbine HCl rather than bark extract; the content in extracts varies too much to dose
- Do not take late in the day
Legal status by region
Regulation differs considerably between jurisdictions and changes over time. This is a rough orientation, not legal advice — check the rules that apply where you are.
| Region | Regulatory status |
|---|---|
| United States | Prescription-only medicineApproved for defined indications; use outside them is off-label. |
| EU / UK | Prescription-only medicineApproved for defined indications. |
| Canada / Australia | Prescription-only medicine |
| Parts of Asia, Latin America & Middle East | Pharmacy availability variesSeveral countries dispense it without prescription in practice. Rules and enforcement differ and change. |
| Competitive sport | Check the current WADA listSome substances in this class are prohibited, others are not. |