Importance of Amino Acids and Polypeptides
According to studies[iii], amino acids play a vital role.
Currently, scientists are performing extensive amino acid and polypeptide research to gain a fuller understanding of their effects. Amino acids in medicine are continually being explored in clinical research and in animal studies for more information on their functions. While not FDA-approved, you can buy polypeptides and amino acid proteins for your research studies as of September 2023.
[i] Knoop, Andre, Andreas Thomas, Eric Fichant, Philippe Delahaut, Wilhelm Schänzer, and Mario Thevis. “Qualitative Identification of Growth Hormone-Releasing Hormones in Human Plasma by Means of Immunoaffinity Purification and LC-HRMS/MS.” Analytical and Bioanalytical Chemistry 408, no. 12 (February 15, 2016): 3145–3153. doi:10.1007/s00216-016-9377-3.
[ii] Dillon, Edgar L., Melinda Sheffield-Moore, Douglas Paddon-Jones, Charles Gilkison, Arthur P. Sanford, Shanon L. Casperson, Jie Jiang, David L. Chinkes, and Randall J. Urban. “Amino Acid Supplementation Increases Lean Body Mass, Basal Muscle Protein Synthesis, and Insulin-Like Growth Factor-I Expression in Older Women.” The Journal of Clinical Endocrinology & Metabolism 94, no. 5 (May 1, 2009): 1630–1637. doi:10.1210/jc.2008-1564.
[iii] BARRETT, EDWARD J. “COMMON POLYPEPTIDE SECONDARY STRUCTURES.” Assembly Instructions for Polypeptide Models (1982): 18–20. doi:10.1016/b978-0-12-462431-3.50009-1.