Yohimbe Bark Extract has been available by a prescription in pill form since its approval by the FDA for impotence. Recently it has become popularized as an over the counter sexual stimulant. This causes a dilation of blood vessels, particularly in the penis. A combined analysis of over a dozen scientific studies published in the journal Archives of Sexual Behavior, August 1996, concluded that yohimbe improves sexual performance. Panax Ginseng Extract has a reputation as an aphrodisiac and for good reason.
Researchers note the herb stimulates the central nervous system.
In addition, ginseng contains phytochemicals that lessen fatigue and increase stamina. A study published in the journal British Pharmacology, May 1995, concluded that substances in ginseng extract known as ginsenosides work in a similar way as Viagra in enhancing the effects of nitric oxide, which helps relax artery walls, allowing more blood flow into the penis. L-Phenylalanine is a precursor to tyrosine, which converts to the neurotransmitters norepinephrine, epinephrine, dopamine, and tyramine. L-Arginine is an essential amino acid and plays a multiplicity of roles in the body. Aside from bolstering the immune system, increasing human growth hormones, and helping remove excess ammonia from the body, it is also needed to increase protein synthesis.