When a man is unable to achieve an erect penis, this is commonly called erectile dysfunction, or impotence. Causes of this disorder vary and include blood vessel obstructions, low sex drive, stress, prostate problems and medication side effects. Psychological reasons can play a significant role in impotence, however, on average these make up only about 10 percent of cases. Physical factors are the dominant reasons impotency occurs in most men affected by the disorder, according to the website Herbs2000.
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Ginkgo biloba is mainly used to increases blood circulation and it is thought to improve cases of erectile dysfunction caused by blood vessel obstructions and lowered sex drive because it increases blood flow to the penis. The recommended dosage of ginkgo biloba is 80 mg taken three times daily, according to Herbs2000. Six to eight weeks of treatment may be necessary before the initial benefits of gingko biloba are noticeable.
Pygeum africanus is an herb that grows primarily in the highlands of Africa and on the island of Madagascar. In cases that involve erectile dysfunction, pygeum is effective if the cause is related to prostate disease. Specifically, prostate gland inflammation, male sterility and erectile dysfunction due to inadequate secretions from the prostate gland, are the primary indications for the use of pygeum. Additionally, the herb is thought to have an aphrodisiac effect, according to Herbs2000. The recommended dosage is 100 mg taken two times per day between meals.
Ginseng has been used by Chinese medical practitioners for thousands of years and is considered a reliable natural treatment for impotence. The herb is classified as an adaptogen, which means it corrects imbalances in the body that can cause erectile dysfunction that include inadequate testosterone production, physical exhaustion, chronic illnesses, compromised immunity and psychological stress. The recommended dosage for ginseng is 100 to 300 mg standardized extract two times per day. During treatment, Siberian and panax ginseng should be rotated every 14 days to prevent tolerance issues, according to Herbs2000.