Yohimbine Hydrochloride · Yohimbe
Yohimbine is an indole alkaloid isolated from the bark of the Pausinystalia yohimbe tree (native to central and western Africa), and also found in several other plants including Rauwolfia species. The hydrochloride salt (yohimbine HCl) is the pharmaceutical-grade form used in research and in products positioned for sexual health and stubborn-fat-loss applications. It is a selective alpha-2 adrenergic receptor antagonist.
Standard protocol is 0.1-0.2 mg/kg body weight taken 30-45 minutes before fasted morning cardio. A 70 kg user starts at 5-7 mg, works up to 10-14 mg if tolerated. Do not take with food if the goal is regional fat loss - insulin suppresses the lipolytic effect. Avoid evening dosing; the short half-life is convenient but the CNS stimulation disrupts sleep.
Start here. Every protocol below is ordered lowest-first. Begin at the smallest effective dose, hold about a week to assess tolerance, and step up only if needed.
Yohimbine is a selective competitive antagonist at alpha-2 adrenergic receptors (both pre- and postsynaptic). In adipose tissue, alpha-2 receptors are inhibitory autoreceptors - when noradrenaline binds them, lipolysis is dampened. Regional fat depots with high alpha-2-to-beta-receptor ratios (for example the lower abdomen and lower back in men, hips and thighs in women) are relatively resistant to lipolysis because alpha-2 signaling out-competes beta signaling locally. Blocking alpha-2 with yohimbine removes this brake and allows beta-adrenergic lipolysis (endogenous or stimulated by exercise / fasted state) to act on these regional depots.
At the central nervous system level, alpha-2 antagonism increases noradrenergic tone by disinhibiting presynaptic noradrenaline release - this drives the characteristic anxiety, tachycardia, and elevated blood pressure seen at higher doses. Insulin concurrently suppresses lipolysis (insulin-stimulated adipose tissue has little noradrenergic traffic for yohimbine to augment), which is why fasted-state dosing is standard for fat-loss use.
Yohimbine has a notably short half-life (around 36 minutes to 2 hours depending on individual CYP2D6 metabolism), so effects rise and fall quickly. It also has mild 5-HT and alpha-1 activity at higher concentrations.
First dose: CNS activation within 20-45 minutes - alertness, mild anxiety, warmth, slight tremor. Effects peak at 1-2 hours and fade by 3-4 hours in most users.
Week 1-2: regional fat-loss effect becomes measurable when combined with fasted cardio and caloric deficit. Users often report improved skin tightness in traditionally resistant areas.
Weeks 3-6: continued regional fat loss. Because yohimbine removes a local brake rather than driving lipolysis directly, it works best as an adjunct to an established caloric deficit and exercise plan, not as a standalone fat-loss agent.
Each reference below was re-fetched from its PubMed record, and the quoted sentence was confirmed to appear in that abstract and to support the claim it sits under. Follow any of them to read the source.
Exact-molecule evidence boundary: the live abstract reports the quoted finding for Yohimbine HCl; no broader inference is made.
We systematically reviewed and meta-analyzed all randomized, placebo controlled trials of yohimbine monotherapy for erectile dysfunction to determine its therapeutic efficacy.
Evidence scope. Exact molecule wording appears in the quoted live sentence. Only the population/model, formulation, route, and outcome expressly stated there are supported.
Claims we could not support
No abstract we checked supports these for this molecule at this route. That is not the same as saying they are false — it marks where the evidence is missing.
Dose/route: 5mg; Oral; 1-2x daily. No selected live abstract sentence verified this complete regimen.
Mechanism as written in source JSON. No selected live abstract sentence verified the complete mechanism at the card formulation/route and relevant population/model.
Primary safety claim as written in source JSON. No selected live abstract sentence verified the complete safety claim for this exact formulation and route.
To 2 hours (highly variable by CYP2D6 metabolizer phenotype)
Oral (highly variable, dependent on CYP2D6 activity)
Per dose - supports pre-cardio or pre-training use
Hepatic metabolism (CYP2D6 primary). Renal excretion of metabolites.
Storage. Store at controlled room temperature (20-25°C / 68-77°F). Protect from light and moisture. Keep in original container. Shelf life typically 2-3 years from manufacture date. Keep out of reach of children - overdose can produce severe hypertension and anxiety.
Yohimbine HCl historically FDA-approved as Yocon (Palisades Pharmaceuticals) for erectile dysfunction; the brand is largely absent from the US market today. Prescription yohimbine HCl remains available through compounding pharmacies. Yohimbine is also sold as a dietary supplement in the United States at lower potencies. Not a controlled substance. Not prohibited by WADA, though monitored. Banned for sale in some jurisdictions (Canada, Australia) outside of prescription.
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