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L-arginine is one of 20 amino acids produced in the body that is needed to make protein. It is considered a semiessential amino acid because although your body generally can make adequate amounts, levels of this amino acid naturally decrease with age and with stress-related conditions.
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Your body is able to make L-arginine, but during times of illness and stress, you may not be able to make enough to support needs, which makes this amino acid a conditionally essential one (see reference 1 under Conditional amino acids).
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