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Arginine is an amino acid that can be found within the body. Amino acids are the building blocks of protein and are what proteins are broken down into ready for the body to use to help repair the body. Some amino acids are made in the body while others have to be sourced from diet and supplements when required by the body for growth and repair. Arginine is made in the body but for physical activities such as resistance training more is required because more is in demand.