Referred to as the ‘building blocks of life’, amino acids make up proteins in every tissue of the body, and play a major role in nearly every chemical process that affects physical and mental function. Amino acid deficiencies may manifest as fatigue, allergic sensitivity, arthritis, digestive disorder, cognitive function, weakened cardiovascular health, decreased athletic performance and neurologic imbalance. DirectLabs offers a range of tests to help you determine your specific amino acid levels.