For 2000 years, horny goat weed has been used as a medicinal herb in reproductive tonics for boosting libido and treating impotence, as well as in rejuvenating tonics to relieve fatigue and reduce stress.

Studies have shown this time-tested aphrodisiac works in several ways to help male sexual performance.

First, horny goat weed works as an adaptogen by increasing levels of epinephrine, norepinephrine, serotonin, and dopamine when they are low-promoting energy-but reduces cortisol levels when they are elevated (an anti-stress effect). High stress conditions and increased cortisol levels cause fatigue and depresses sex drive.

The second effect is the restoration of low levels of both testosterone and thyroid hormone to normal - improving sex drive.

Finally, horny goat weed contains a variety of flavonoids. One prominent flavonoid is icariin, which is a cGMP-specific PDE5 inhibitor like the synthetic prescription drugs Viagra®, Cialis®, and Levitra®.

During sexual excitation the erection is mediated by nitric oxide released from nerve endings close to the blood vessels of the penis. Relaxation of these vessels causes blood to pool producing an erection. The popular prescription drug Viagra(sildenafil citrate) inhibits the breakdown of nitric oxide and thus enhances its effect. The Icariin in horny goat weed works in a similar way to Viagra.

Tribulus Terrestris Extract

 Known as a natural testosterone enhancer, tribulus can improve desire, performance, and increase sexual energy. Tribulus is also an excellent circulatory system tonic and can help build muscle and strength, as well as reduce muscle recovery time.

Clinical studies on the sexual activity-enhancing effect of tribulus have shown the herb to contain protodioscin, a saponin constituent, improving libido in men with impotence due to various causes, libido in women with menopausal symptoms, and sperm motility in infertile and subfertile men.

In another study involving men, ages 22-67, suffering from a range of sexual dysfunctions, Tribulus was used three times daily. An increase of sexual desire and fantasies, as well as sexual self-confidence, were reported in almost all of the patients. The subjective experience of pleasure, joy and satisfaction was reported in 80% of the men; erection improved in over 75% of the men; and the duration of intercourse before ejaculation was prolonged in 25% of the men.

Tongkat Ali  Extract (Eurycoma longfolia)

The root (long jack root) of the Eurycoma longifolia tree has been used for centuries as a traditional remedy for fatigue, loss of sexual desire, and impotence. It also contains superoxide dimutase, an anti-oxidant enzyme that inhibits the chain reaction of free radicals harmful to the body.

The bioactive Glygopeptide compounds in Tongkat ali were shown to increase free testosterone and decrease SHBG levels in human clinical trials. Both effects assist a mans erection ability, performance and sex drive.

In the study by Ismail Tamby, MD, head of the Human Reproductive Specialist Center in Kuala Lumpur, 90% of men given Tongkat ali extract reported a boost to their libido and 73.3% reported improved sexual function.

Studies have also shown that Tongakat ali increases sperm count, sperm size and motility.

Mucuna Pruriens Extract

 Clinical studies in India have validated mucuna pruriens' aphrodisiac activity. It also has anabolic and growth hormone stimulant properties. The anabolic effect of the seed increases testosterone.

In 2002, a U.S. patent was filed on the use of mucuna pruriens to stimulate the release of growth hormone in humans. The high levels of l-dopa in the mucuna seed are converted to dopamine which stimulates the release of growth hormone by the pituitary gland. L-dopa and dopamine are also effective inhibitors of prolactin. Increased levels of prolactin are considered responsible for 70-80% of erection failure in males.

In one study, oral intake of the seeds by human males improved erection, duration of coitus, and post-coital satisfaction after only four weeks. The seed also has fertility-promoting and spermatogenic effects in human males, being able to improve sperm count and motility.

Maca Root Extract

The first reported use of maca root dates back to the Inca Warriors of South America who ate maca to increase their strength and stamina before battle. Throughout South America it is used as a general nutrient to increase libido and reproductive health.

It's effect is due to sterols which act on the hypothalamus, pituitary, and adrenal glands, producing hormones, leading to increased energy and libido.

Shilajit Extract

Shilajit provided an anti-oxidant defense against several reactive oxygen types. Shilajit provided complete protection to methacrylate against hydroxyl radical-induced polymerization, and acted as a reversible nitric oxide-captodative agent. These findings are consistent with the therapeutic uses of Shilajit as an Ayurvedic (rejuvenator) against oxidative stress and geriatric complaints erectile dysfunction. Shilajit works like Viagra to enhance the effect of nitric oxide to produce an erection.

Ashwagandha Extract - "Indian Ginseng"

Known as "Indian Ginseng," Ashwagandha provides powerful nutritional support to energize and rejuvenate. It helps minimize the negative effects of stress, enhances immunity & helps build deep vitality, promotes sexual and reproductive balance.

Ginkgo Biloba

Pygeum Bark Extract

Pygeum bark has long been used to assist genital and urinary health in men. It is shown to decrease excessive prostate growth, a common contributor to weak erections and sexual function in men over the age of 40. It also helps tissues in the genital area better utilize oxygen.

Magnolia Bark Extract

Magnolia bark is used to control stress and anxiety, but in a different way than Gotu Kola. Magnolia bark is rich in two biphenol compounds, (magnolol and honokiol). These compounds lower cortisol levels caused by stress, which inhibits a man's sexual ability and response. Also, magnolia bark has the added benefit of containing the essential oil eudesmol (triterpene compound), an antioxidant.

Cinnamon Bark

Cinnamon is used as a natural preservative and food anti-oxidant to preserve the strength and effect of all of the herbal ingredients in Zenerx.

It also helps prevent and combat diabetes (a common cause of Erectile Dysfunction) by acting as an insulin substitute for people with type 2 diabetes, according to cellular and molecular research done jointly by the University of California, Santa Barbara, Iowa State University and the U.S. Department of Agriculture.

Cinnamon is also a circulatory stimulant, increasing blood flow throughout the body.

Niacinamide

Niacin improves circulation by relaxing arteries and veins, and disorders characterized by circulation difficulties benefit from usage. It also works on a cellular level to keep the digestive system, skin and nerves healthy.

Zinc

We included zinc in Zenerx to ensure you get enough of this mineral, essential to testosterone production and healthy sperm count. Inadequate zinc levels can cause hypogonadism, resulting in loss of sex drive, weakness, impotence, infertility, and osteoporosis.