The active ingredient in Yohimbe Bark extract is Yohimbine. Yohimbine has been used as an aphrodisiac for centuries. Yohimbine was approved by the FDA in 1990 as a treatment for impotence.
Yohimbine can cause a significant increase in the release of noradrenalin from nerve endings. This action stimulates the nervous system, raises core temperature, and causes the body to mobilize body fat for fuel. (Dr. Colgan - Optimum Sport Nutrition)
Yohimbine serves as a potent stimulant, aphrodisiac, and as a significant aid in a weight loss program.
The majority of the "Yohimbe" products on the market contain 10mg or substantially less of the active ingredient Yohimbine. Sci Fit's Massive Yohimbe 1200 contains an astounding 24mg of Yohimbine per capsule!