Yohimbine is promoted for its fat-burning properties and benefits for male sexual dysfunction. Though yohimbine is effective, side effects may include anxiety, nervousness, and an elevated heart rate, and the reported dose of yohimbine in many supplement formulas doesn’t match the actual dose.
Yohimbine is most often used for
Yohimbine is a naturally occurring alkaloid found in the Pausinystalia yohimbe tree and the Rauwolfia serpentina plant. Yohimbine is a stimulatory compound that primarily acts on the alpha-2-adrenergic receptors in the body. It’s best known for its ability to increase fat burning (lipolysis) and aid in male sexual dysfunction. Yohimbine supplementation is also used for weight loss, body composition, treatment of phobias, and orthostatic hypotension, though there is a lack of evidence to support yohimbine’s benefits for many of these conditions.
When taken at the recommended dose (≤0.2 mg per kg of body weight), yohimbine may cause nausea, abdominal pain, dizziness, nervousness, and anxiety.
Higher doses of yohimbine may be dangerous; a report from 2005 found that yohimbine had the highest rate of toxic effects of any botanical product. Case reports of excess yohimbine ingestion have suggested that anxiety, hypertension (high blood pressure), tachycardia (high heart rate), arrhythmias, and agitation are among the more severe side effects of this compound.
Furthermore, many yohimbine-containing supplements in the U.S. were found to be inaccurately labeled — they contained 23%–147% of the yohimbine reported on the label and failed to report the amount of yohimbine contained in the product or warn of the potential harms of excess consumption.
Yohimbine is a selective alpha-2-adrenergic antagonist. In other words, it targets and inactivates a class of receptors in the nervous system that is responsive to the neurotransmitter norepinephrine (noradrenaline). Alpha-2 receptor antagonism enhances the sympathetic nervous system release of norepinephrine, causing the stimulatory and “hyperadrenergic” effects of yohimbine.
Antagonism of alpha-2 receptors also inhibits penile smooth muscle contraction and may enhance nitric oxide-mediated smooth muscle relaxation — the combined effects of which promote erection and explain the improvement in ED symptoms after supplementing with yohimbine. Yohimbine also inhibits the activity of alpha-2 receptors on fat cells — where norepinephrine normally acts to suppress fat release. Inhibition of the antilipolytic effect of norepinephrine allows more lipolysis (fat burning) to occur.
- Corynanthe Yohimbe
- Yohimbe Bark
- Pausinystalia Yohimbe
Dosages of 0.2mg/kg bodyweight have been successfully used to increase fat burning without significant implications on cardiovascular parameters like heart rate and blood pressure. This results in a dosage of:
- 14 mg for a 150lb person
- 18 mg for a 200lb person
- 22 mg for a 250lb person
Supplementation is most effective between meals or during short term fasting.
Caution should be exercised at higher body weight, since the cardiovascular system may not be prepared to handle a stimulatory agent such as yohimbine. When supplementing yohimbine for the first time, always start with a half-dose and assess tolerance before proceeding.
Caution should also be exercised since many supplements containing yohimbine either do not list how much yohimbine is included, or if they do, the actual dose ranges from 25-150% of the dose listed. Since the dosage may be higher than listed, this is extra reason to start with a lower dose.
When pairing yohimbine with other stimulatory agents, half-dose both supplements and work up to the recommended dose cautiously, as two supplements can interact negatively.
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