L-Arginine is a proteinogenic amino acid. Although it is a non-essential amino acid, it is sometimes referred to as conditionally essential for specific conditions that the adequate amounts cannot be synthesized. Foodstuffs such as peanuts, soy beans, meat (beef, chicken), egg yolks, eel and garlic contain high L-arginine. It is a precursor to the vasodilator NO (Nitric Oxide), and it is one of the components of the urea cycle, a process involved with the detoxification of ammonia.
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