Watermelon may be a natural Viagra, says a researcher. That's because the popular summer fruit is richer than experts believed in an amino acid called citrulline, which relaxes and dilates blood vessels much like Viagra and other drugs meant to treat erectile dysfunction (ED). The amino acid citrulline is converted into the amino acid arginine, Patil says. "This is a precursor for nitric oxide, and the nitric oxide will help in blood vessel dilation."
It has been shown that that a typical 4-ounce serving of watermelon (about 10 watermelon balls) has about 150 milligrams of citrulline. But it has not been proved that how much citrulline is needed to have Viagra-like effects.
One research scolar said that Calling watermelon a natural Viagra is "clearly premature,"
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