Proline is an amino acid that is important for maintaining muscle protein integrity and plays an important role in the production of collagen, a protein that helps to keep our bones, skin, and connective tissues healthy. Proline's chemical structure has a unique ring structure, making it one of the most chemically reactive amino acids. Proline is also involved in signaling pathways, allowing it to effectively modulate how proteins are expressed in different tissues. Furthermore, it is involved in some metabolic processes, including energy production, oxidative stress resistence, and gene regulation.