Summary
Citrulline is an amino acid found in watermelon
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and is considered nonessential, meaning that the body can produce some on its own.
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It is one of the three dietary amino acids in the urea cycle
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and is also produced as a byproduct of the enzymatic production of nitric oxide from the amino acid arginine.
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Citrulline has the formula H2NC(O)NH(CH2)3CH(NH2)CO2H
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and is a key intermediate in the urea cycle, the pathway by which mammals excrete ammonia by converting it into urea.
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According to
