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16. Watermelon

In addition to being a refreshing part of the summer menu, watermelon has a non-essential amino acid called l-citrulline that is being tested in clinical trials as an antihypertensive. L-arginine, another amino acid important hormone release and immunity, is a precursor of nitric oxide, which aids in blood vessel dilation and reducing blood pressure. Because l-citrulline is a precursor of l-arginine, it is considered a vital piece of this process.

L-citrulline watermelon l-arginine nitric oxide DebbiSmirnoff / Getty Images

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