Yohimbine is a stimulant alkaloid taken from the bark of the yohimbe tree. Doctors once studied it for erectile dysfunction, but the evidence was thin and safety worries were large. These days supplement makers sometimes put it in pre-workout blends. The theory is that blocking alpha-2 receptors could help free up fat for fuel. Human studies backing meaningful fat loss are weak and dont line up.
As a stimulant, yohimbine pushes heart rate and blood pressure higher. People usually take it on an empty stomach because food gets in the way of absorption. Standard doses run 5 to 20 mg a day, yet even those amounts carry side effects like anxiety, panic attacks, high blood pressure, and a racing heart. Stacking it with caffeine or ephedrine makes those dangers shoot up sharply.
A narrow safety window paired with flimsy proof for most uses means yohimbine is a poor pick for general supplementation. If it gets used at all, it belongs under a professionals watch.