The following chart depicts the most reputable Viagra Alternatives concerning there overall improvement of male sexual performance.

Positive Effects Physicians Select Male Sexual Enhancement Enzyte Herbal Supplements Vipra Herbal Supplements Vig Rx Herbal Supplements *Improved erections (enlargement of both length and girth) *Increased Libido (sexual desire) *Increased Testosterone *Improved Stamina, muscle growth, and sense of well being

*Please see below for a complete explanation of the positive effects of these supplements:

*Improved erections (enlargement of both length and girth) - L-arginine through its oxidation process to nitric oxide, plays a significant role in the erection process. Research has shown that increased levels of nitric oxide can correct up to 90% of the clinical cases of erectile dysfunction. The role of nitric oxide in controlling blood flow was only recently discovered in 1998 resulting in a Nobel Prize for scientific discovery. The increase release of nitric oxide further allows the blood within the penis to dilate, increasing both the length and girth of the penis. From this discovery, the researchers at Physicians Select Male Libido (Viagra Alternative) further researched the importance of L-Arginine in the male libido enhancer supplement to promote the optimal male sexual response.

*Increased Libido (sexual desire) - Herbs present in the proprietary blend of Physicians Select Male Libido (Viagra Alternative) formula improves sexual function by displacing hormonal epinephrine from the alpha-2 adrenergic receptors in the pelvic area and increasing blood flow to the male erectile organs. Second, the herb increases the levels of free norepinephrine which subsequently results in an increase sense of alertness and sexual arousal. In fact, one of the active ingredients was the only product approved by the Federal Drug Administration (FDA) for the treatment of impotence prior to the introduction of Viagra

*Increased Testosterone - Tribulus terrestris increases muscle mass and improves erections by increasing testosterone levels in a unique fashion. Unlike, dehydroepiandrosterone (DHEA) or Androstenedione, which simply act as testosterone precursors, Tribulus terrestris increases testosterone levels by increasing the levels of Lutenizing Hormone (LH). LH is responsible for signaling the leydig cells in the testes to release testosterone. Epimedium has also been shown to increase the pituitary gland's production of androgens thus increasing testosterone production and release, promote erectile response, stimulates the sensory nerves and supports muscular growth and health. Physicians Select Male Libido (Viagra Alternative) offers the largest percentage of this all important herb, Tribulus terrestris, in thier Viagra Alternative Supplement.

*Improved Stamina, muscle growth, and sense of well being - Modern studies at the Institute for Advanced Study of Human Sexuality have shown that Avena sativa helps improve male libido and sexual performance dramatically. They have shown that Avena sativa exerts its action by freeing up testosterone. Bound testosterone is not as effective as free testosterone in promoting sexual performance and desire. Free testosterone also increases stamina and promotes muscle growth. The study also showed that males have reported positive results including better stamina and an overall feeling of well being.

Please note: The rating of how the herbal supplements promote the improvement of male sexual performance were compiled using data from physicians who have previously prescribed these supplements and from individuals who have taken the time to complete the following survey.

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