Muira puama,  is known for its libido enhancing effects as well as for its beneficial effects on rheumatism and muscle paralysis. When taken, it acts as a natural testosterone releaser.

According to a study done by Dr. Jacques Waynberg at the Institute of Sexology in Paris, the herb was found to have beneficial effects in the improvement of libido and treatment of erectile dysfunction in men.

His study concluded with the statement that "Muira puama, a natural testosterone releaser, may provide better results than yohimbine without side effects."

He also conducted another study using the same herb but this time on its effects on asthenia, a condition  characterized by fatigue, weight loss and debility, which are all symptoms of testosterone deficiency. The herb was shown to have caused a significant improvement in the frequency of sexual intercourse in 66% of the couples involved in the study, and 70% of the men in the study reported an improvement in sexual desire.

The herb was also reportedly extremely effective at improving morning erections.

Updated: 12/21/09