Here's some scientific, as well as anecdotal and historical, evidence on the efficacy of few substances which are known as aphrodisiacs or sexual male enhancers.
Also know as "potency wood," muira puama is a small tree native to the Brazilian Amazon and other parts of tropical South America . Two varieties of the tree are used in herbal medicine, though the Ptychopetalum olacoides variety is the regarded as the most potent as it has a higher content of lupeol, one of the plant's active phytochemicals.
All parts of the plant are used to some degree in herbal medicines, but the bark and roots are regarded as real treasures.
Native peoples in the Amazon have used muira puama to treat a number of ailments, including neuromuscular problems, paralysis, flu, gastrointestinal problems and, of course, impotence. Today the plant extract is highly regarded as an aphrodisiac and a preventive for baldness.
European explorers eventually discovered the plant's use as an aphrodisiac and impotence treatment, and brought it back to Europe where it became popular as an herbal remedy to treat the same ailments it cured for millennia in the rainforest. In recent years, muira puama has gained a strong following in the United States , where it is also used to treat depression, menstrual cramps and disorders of the central nervous system.
Researchers began searching for the secret to the plant's potency back in the 1920s and discovered that the root and bark were rich in fatty acids and fatty acid esters, essential oils, plant sterols, triterpenes such as lupeol, and a new alkaloid, which they named muirapuamine . Later research revealed that the plant was also rich in free long-chain fatty acids, sesquiterpenes, monoterpenes and novel alkaloids.
According to Rain Tree Nutrition, a leading source of information on herbal medicines from the tropics, researchers found that muira puama was effective in treating disorders of the nervous system and sexual impotence, and boosting libido. In one study conducted in France, around two-thirds out of 262 male patients who experienced lack of sexual desire and the inability to attain or maintain an erection reported that muira puama
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