Watermelon contains high amounts of L-citrulline. This is a nonessential amino acid. Once it’s taken up by your nitric oxide system, it then promotes blood vessel dilation. As a result, your blood pressure decreases. Blood flow also improves.
L-citrulline may help stimulate enzymes called cGMPs. They play a direct role in blood flow. The thought is that more L-citrulline consumption could help improve ED. Unscientific accounts of L-citrulline are numerous on the internet, especially by supplement manufacturers.
"Foods that are high in antioxidants and amino acids allow your body to function optimally," said Angela Lemond, a Plano, Texas-based registered dietitian nutritionist and spokesperson for the Academy of Nutrition and Dietetics. "Antioxidants help prevent damage, and cancer. Amino acids are the basic building block for protein, and protein is used in virtually every vital function in the body."
Scientists have taken notice of watermelon's high lycopene levels — about 15 to 20 milligrams per 2-cup serving, according to the National Watermelon Promotion Board — some of the highest levels of any type of fresh produce. Lycopene is a phytonutrient, which is a naturally occurring compound in fruits and vegetables that reacts with the human body to trigger healthy reactions. It is also the red pigment that gives watermelons, tomatoes, red grapefruits and guavas their color.
Lycopene has been linked with heart health, bone health and prostate cancer prevention. It's also a powerful antioxidant thought to have anti-inflammatory properties, according to Victoria Jarzabkowski, a nutritionist with the Fitness Institute of Texas at The University of Texas at Austin.
To really maximize your lycopene intake, let your watermelon fully ripen. The redder your watermelon gets, the higher the concentration of lycopene becomes. Beta-carotene and phenolic antioxidant content also increase as the watermelon ripens. "Beta carotene is an antioxidant found in red-orange fruits and vegetables. It helps with immunity, skin, eye and the prevention of cancer," said Lemond.
A 2011 study in the Journal of Food Composition and Analysis that investigated five types of watermelon at four stages of ripening found that unripe watermelon with primarily white flesh has nearly zero beta-carotene. By the time it is fully red, the fruit has become an excellent source of the phytonutrient. - LIVESCIENCE
In terms of scientific data, a few studies have looked at the role of L-citrulline in ED. One study published in Urology found that 24 men who took supplements over the course of a month noted improvements in mild ED symptoms. Another study looked at the effect of watermelon extract on male rats’ sexual activity and found an increase in activity. More long-term research needs to be conducted to explore the efficacy and overall safety of L-citrulline.
Want the Viagra effect without taking a pill? Try eating a watermelon.
Watermelons contain an ingredient called citrulline that can trigger production of a compound that helps relax the body's blood vessels, similar to what happens when a man takes Viagra.
Found in the flesh and rind of watermelons, citrulline reacts with the body's enzymes when consumed in large quantities and is changed into arginine, an amino acid that benefits the heart and the circulatory and immune systems.
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