Amino acid blends or complexes are scientifically validated as supportive to the structural system, which primarily includes bones, muscles, tendons, and connective tissue. Amino acids are the fundamental building blocks of proteins, which are essential for the growth, maintenance, and repair of these structural components. Numerous studies demonstrate that adequate intake of essential amino acids is critical for muscle protein synthesis, preservation of lean body mass, and recovery from injury or exercise-induced muscle damage. For example, branched-chain amino acids (BCAAs), such as leucine, isoleucine, and valine, play a particularly important role in muscle metabolism and repair. Additionally, amino acids like glycine and proline are necessary for collagen synthesis, which is vital for connective tissue and bone health.

Clinical research has shown that supplementation with amino acids can help reduce muscle wasting in periods of inactivity or illness, promote muscle recovery, and support bone and joint health by providing the necessary substrates for tissue repair. This scientific consensus is reflected in guidelines for sports nutrition and in recommendations for recovery from musculoskeletal injuries. However, the level of evidence varies depending on the specific blend and target population, but the general role of amino acids in supporting the structural system is well-established.