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L-Arginine
 
L-Arginine is a naturally-occuring "non-essential" amino acid.

Source
L-Arginine is supplied in 500mg and 1,000mg capsules as well as a powder (1 teaspoon equals 4,000mg). It is a substance produced by one's own blood vessels that keeps the blood vessel open (vasodilatation) rather than spastically closed (vasoconstriction), dilating the coronary and other arteries. Arginine has received favorable reports in preventing and treating heart disease, cancer and infection. Areginine has been found to be useful in treating sterility in men. Arginine may prevent angina (chest pain due to coronary vasoconstriction) or a heart attack.

Working on the peripheral arterioles, it is used to treat or prevent heart failure (the inability of the heart as a pump to keep up with the bodily needs of supply). It has been exceedingly helpful in peripheral arterial disease in which the leg does not get enough blood for the exercising muscle, resulting in leg cramps. L-Arginine prevents the build-up of cholesterol plaque and clots within all of our blood vessels. Arginine may help release our growth hormone, the naturally rejuvenating hormone. It also may promote sexual function, keep blood pressure normalized, improve coordination and long term memory and enhance our sense of smell. Arginine is also is a free radical scavenger, not only internally but externally, thus causing an anti-aging effect on the skin and the internal organs. Additionally, Arginine has been shown to stimulate the immune function in several animal studies.

It has been used in combination with traditional approaches for the treatment of cancer, particularly cancer of the breast. In an article from The University of Minnesota, oral L-Arginine in doses of 3gm twice a day taken with meals was recommended.

Side-Effects
This is an extremely safe product and the only side-effect ever described in an overdose of L-Arginine was mild diarrhea. It is best to split the dose into 3gm twice per day. Some doctors recommend up to 12gm per day.
 
L-Arginine benefits or hinders:
 
Cancer, General
Erectile Dysfunction (ED, Impotence)
Herpes Simplex Type I
Intermittent Claudication
Interstitial Cystitis
Lipo-Oxidative Type